How to part exchange your car – the ultimate guide

Looking to buy the perfect car for you but don’t have enough available funds? Then part exchanging your vehicle might be the answer. In this ultimate guide, we’ll dig deep into how part exchanging works, how to get the highest valuation for your vehicle , and how to try to negotiate with your dealer for more money.

Key Takeaways

Offsetting Value: Part exchange allows you to use your current car’s value to reduce the price of your next vehicle.
Convenience vs. Profit: It is the easiest way to switch cars, but selling privately or to online services often yields a higher valuation.
Dealer Priorities: Dealers look for low mileage, full service history, and popular models (like SUVs) to maximize their resale potential.
Cost to Change: Focus on the final price difference you pay for the new car, rather than just the trade-in offer for your old one.
Preparation: Clean your car and gather essential documents like the V5C logbook and MOT certificate to secure the best deal.

How does part exchanging work?
Is part exchange always a good choice?
Car value and the finances of part exchange
Part exchange and dealer’s choice
What do car dealers look for with part exchange?
Part exchange vs. online car-buying services
Getting a better offer for your part exchange
Part exchange costs to change car
Runout models and part exchange
What documents do you need to part exchange?
Be prepared to walk away from a part exchange
The best way to sell your car

How does part exchanging work?

Part exchanging is a way of using your current car as part-payment towards your next one. Instead of selling separately and buying separately, you combine both into a single transaction at the dealership.

Here is how the process typically works:

You find a new or used car you want to buy at a dealership
The dealer values your current car and offers a price for it
That price is deducted from the cost of the new car
You pay the remaining difference, either upfront or through a finance agreement

If there is finance on your car, the outstanding balance will be settled as part of the deal. If you own your car outright, the value is simply offset against the new purchase price.

Is part exchange always a good choice?

a ford kuga being driven — Get your price right with part exchange. Sell with prior knowledge of your car’s value.

Not always. If you have the money to buy a new car without needing to part-exchange, it can be worth considering other options first.

Part exchange is undeniably convenient, but that convenience often comes at a cost. The price you receive for your old car in a part exchange is typically lower than what you might achieve by selling it separately. That is because a part exchange is designed to be quick and simple for both sides, and simplicity usually means a compromise on price.

If you are going to a dealership as a cash buyer, you tend to have more room to negotiate. And if you sell your old car privately or through an online selling platform, you are likely to get a better return than trading it in.

Car value and the finances of part exchange

Part exchange can feel straightforward on the surface, but the finances behind it are more complex than they first appear.

When you part-exchange your old car, you are not just agreeing on one price. You are negotiating:

The value of your old car
The price of the new car
Any finance terms, deposit amounts, and monthly repayments

All of these are connected, which makes it harder to see whether the overall deal is genuinely good value. A generous-sounding offer on your old car might be offset by a higher price on the new one, or by less favourable finance terms.

If there is a time you want to feel confident, it is when you are buying an expensive asset like a car. So if you are thinking about part-exchanging, it is important to carefully consider all the options first.

In most cases, you will get more money if you sell your old car separately through an online car buyer. This also makes buying the new car a simpler process, with clearer numbers and potentially lower repayments.

Which cars work best for a part exchange?

There are certain things that dealers look out for in a part exchange deal. These include:

Sought-after models: Popular body styles like SUVs.
Added extras: High-spec technology or safety features.
Low mileage: Vehicles with significantly less wear than average.
Rare factory colours: Unique but desirable paint options.

low mileage dashboard — Dealers are especially keen to part-exchange low-mileage vehicles.

If the car you’re attempting to sell fits any of these criteria, then you’re likely a good candidate for part-exchange. And it’s good to know this when you go in to meet the dealer!

Dealers are also currently favouring SUVs over estate cars and other more traditional styles. But this may change over time.

What do car dealers look for with part exchange?

big dent in a car — Every dent, dint, scuff, or mark will alter your part exchange price.

Dealers will assess your car’s overall condition before making an offer. Every detail matters, from the bodywork and tyres to the service history and MOT status. Here is what they are looking at and what you can do about it:

If your old car is dented, needs scrapping, or has mechanical issues, part exchange can still be a practical route, as it is usually more convenient than arranging a separate sale for a car in poor condition.

Any dealer worth their salt will test drive your old car and look at the bodywork before giving you a price. Your car will probably end up in an auction, and the dealer knows what will get a decent return. And what won’t.

When it comes to your car’s condition, it’s not always the big stuff that makes a difference. There are some things you can do to make sure you get the best price possible:

🧑🔧 Fixing small scratches, scuffs, chips, and dents: Not carrying minor repairs to the bodywork will certainly result in the dealer offering you less money.

🔧 A full service history : Complete records always add value to your car, whereas missing or incomplete history lowers the price and gives dealers pause.

🚘 More than six months left on your car’s MOT : If you have less, make sure to mention this during the initial appraisal and it can have a negative impact on the price offered.

Part exchange vs. online car-buying services

Before going into a part exchange, you need to know how much your car is worth. Do a bit of research on your old car’s value to see what similar models are fetching on the market.

On Motorway, you can get a free, instant valuation and then find your highest offer from verified dealers who compete to buy your car.

If you use any online valuation tool, be specific and honest when filling out the details about your car. Buyers will check the condition carefully, so accuracy gets you the most reliable price.

Here is how part exchange and online car-selling services typically compare:

	Part exchange	Online car-selling service
Convenience	Handled as part of your new car purchase	Separate process, but often completed from home
Price for your old car	Typically lower, as convenience is built into the deal	Often higher, as dealers or buyers compete for your car
Collection	You drop the car at the dealership	Many services offer free home collection
Payment	Offset against your new car purchase	Paid directly to you, often on the same day

Knowing your car’s value before visiting a dealership puts you in a stronger position. Many people arrive without any idea of what their part exchange deal should look like. If you can show you have done your research, you are more likely to negotiate a fair price.

Getting a better offer for your part exchange

There are some simple things you can do to improve your chances of getting a higher valuation and a better offer at the dealership:

🧽 Have the car professionally cleaned, inside and out: A clean car, smelling fresh can make a huge difference.

🔎 Assess the full condition of the car: Check the tyres, body panels, and interior to see if there are any quick, cheap fixes you can do. It’ll result in a better offer.

⚙️ Replace missing parts if it’s cost-effective: You can pick up second-hand hubcaps on eBay or preloved.co.uk . Making sure all the parts are clean, matching and well-installed will help the value.

With all of these options, it’s important to tread carefully with the spending. The idea is to invest in the car to get a better offer.

Part exchange and price negotiation

Be prepared for when the dealer asks you what you want for your old car. Unbelievably, we found that 14% of Brits (3.5 million) have regretted the sale of their car as it was poorly researched and lost them money as a result.

Do not talk to dealers without having a good idea of what your car is worth! The dealer expects to bring your price down, so this way you’ll negotiate from a higher price point and get a more reasonable deal.

Motorway research has found 37% of Brits (14 million) are intimidated by the haggling process of selling their car. Here are our top tips for negotiating:

✅ DO walk away if you get offered an unreasonably low price. This might prompt them to re-negotiate or you can find a better deal elsewhere.
🚨 DON’T just accept the first price they give you – even if it’s the highest.
✅ DO be upfront about the fact you’re meeting with more than one dealer.
✅ DO ask if there are any extras that can be thrown in if they can’t budge on their offer.
🚨 DON’T be intimidated if asked what your budget is or similar.
✅ DO explain that you’re only considering part exchange for convenience.
🚨 DON’T be put off if a dealer says your price is unreasonable. Instead, ask for a CAP price or Glass’s Guide to hand.
✅ DO be wary of any dealer who won’t check the above resources.
✅ DO ask about manufacturer loyalty bonuses. Some brands offer additional discounts when you trade in a car of the same make for a new model from the same manufacturer.

What is the cost to change in a part exchange?

During any part exchange negotiation, keep the ‘cost to change’ in the front of your mind. This is the price you’ll end up paying for the new car in the part exchange.

Many sellers will naturally focus on the price they are being offered for their old car. However, you should also ask what the ‘cost to change’ price is.

red mini cooper parked up — Is your car worth £1,900 outright or £500 as part exchange? No competition.

Just because a dealer has offered you a relatively high sum for your old car, doesn’t mean that you’ll actually be paying less for the new car. For example:

Comparison	Dealer 1	Dealer 2
New Car Price	£6,000	£5,000
Part Exchange Offer	£2,000	£1,500
Cost to Change (Your Cost)	£4,000	£3,500

Before you make your final agreement with the dealer, make sure you know what the cost to change is, compared to other options available to you.

Runout models and part exchange

What are runout models in a part exchange?

A popular tactic that can make part exchange cheaper is asking the dealer what you could get against a ‘runout.’

Runouts are models of cars that are about to be relaunched by the manufacturer and are, consequently, not easy to sell. If you’re keener on getting a cheap deal than a new model, you can pick up a lower-priced runout. So, if there’s a new Toyota in the range being launched in a few months, it’s worth seeing what deal you can get for the current model.

Runout models are cheap due to the fact that cars at the end of their shelf-life tend to depreciate in value much quicker, as many buyers will wait for the new model to appear. As a result, manufacturers cut back the prices of their previous models.

What documents do you need to part exchange?

If you do decide to go ahead with a part exchange, you’ll need to remember to bring the following with you:

📕 The V5C logbook
📃 MOT certificate
🔑 Vehicle keys (including any spare keys)
🔐 Locking wheel nut key
📋 The car’s manual
📕 Service book

And if you’re taking out finance, you’ll also need:

🪪 Driving licence
🛂 Passport
🏦 A bank statement or utility bill (less than 90 days old)

For more info about what documents you need and why, check out our complete guide to the documents required to sell a car .

Be prepared to walk away from a part exchange

Never forget that you are in control throughout the process of buying a car. Until you have signed on the dotted line, received the money, and handed over the keys, you can still walk away.

If you know what your car is actually worth, and you stick to your guns, it’s extremely likely that any dealer will raise the ‘best price’. Plus, the research you do at the initial stage of the process will give you the confidence to walk away from the lower offers.

Though it might seem like a bit of a pain, actually doing the legwork and going around showrooms and dealerships, remains the best option in finding a dealer that wants your car and is prepared to give you a good price. However, at the end of the day, it really comes down to how much value the seller puts on their car – and how much value they put on their time.

Frequently asked questions

Is part exchange always a good choice?

Not always. Part exchange is convenient — you hand over your old car and drive away in a new one without the hassle of a private sale. But convenience often comes at a cost.

When you part exchange, you’re negotiating two things at once: the price of your old car and the price of the new one. That can make it harder to know if you’re getting a fair deal on both.

If you sell your old car separately — whether privately or through an online car-buying service — you’ll usually get more money for it. That puts you in a stronger position as a cash buyer when you go to choose your next car.

The right choice depends on how much you value your time versus maximising the return on your old car.

What do car dealers look for with part exchange?

A dealer will inspect your car carefully before making an offer. They’ll test drive it, check the bodywork, and look at the service history — because they need to know what they can sell it for.

The things that tend to get the strongest offers are:

✅ Low mileage
✅ Full service history
✅ More than six months left on the MOT
✅ No bodywork damage — scratches, scuffs, dents, and chips all reduce the offer
✅ Sought-after models and factory extras

Even small cosmetic issues add up. Fixing minor scratches before your appraisal and having the car professionally cleaned can make a real difference to the price you’re offered.

If your car has mechanical issues or needs significant work, part exchange can still be a practical option — it’s often simpler than organising repairs or a private sale.

What are the disadvantages of part exchanging a car?

Part exchange is one of the quickest ways to move on from your old car, but there are trade-offs worth knowing about:

You may get less money. Dealers factor in their resale costs when making an offer, so part exchange prices are typically lower than private sale values.
Negotiations get complicated. You’re agreeing a price on your old car and your new one at the same time. It can be hard to know if you’re winning on both.
Less flexibility. You’re tied to buying from the same dealer you’re trading in with, which limits your options.

If getting the most from your old car is a priority, selling it separately — through a platform like Motorway — and then buying as a cash buyer often works out better. You can get a free valuation in minutes to see what your car could be worth.

Can I part exchange a car that’s on finance?

Yes, you can part exchange a car that still has finance on it. Here’s how it works:

The dealer contacts your finance company to get a settlement figure — the amount left to pay on your agreement.
That figure is deducted from your part exchange offer.
If your car is worth more than the settlement figure, the difference is applied to your next car.
If your car is worth less than what you owe (called negative equity), you’ll need to pay the difference — either upfront or rolled into your new finance agreement.

Make sure you have an up-to-date settlement figure from your lender before you visit the dealer. For more detail, read our guide on selling a car on finance.

Should you sell your car

If you’re thinking about selling your car quickly and easily, at Motorway we offer a simple method of getting the best price when selling, whatever the model.

Just enter your reg and you will be provided with an instant estimated sale price based on up-to-the-minute market data. We’ll then ask you a few easy questions about your car and guide you through the photos you need to take to complete your vehicle profile. It can be done right from your phone – in a matter of minutes. With 84% of Motorway customers getting more money, it’s never too soon to get your valuation.

If you choose to enter your car into a daily sale, it will be shown to our nationwide network of more than 8,000 verified dealers looking to add to their stock of used cars. Interested dealers will then compete to buy your car, offering you their best price.

In as little as 24 hours, you’ll receive your best offer. And if you choose to go ahead with the sale, your car will be collected by the dealer and the money will be quickly and securely transferred to your bank account.

The information provided on this page is for general informational purposes only and should not be considered as professional advice.