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The single most important piece of routine maintenance your engine needs.
An oil and filter change is exactly what it sounds like: draining the old engine oil, replacing the oil filter, and refilling with fresh oil that meets your manufacturer's specification. It's the foundation of every car service, and the one job that has the biggest impact on how long your engine lasts. Engine oil lubricates hundreds of moving parts, reduces friction, carries heat away from the combustion chamber, and suspends microscopic metal particles and carbon deposits so they don't grind against bearing surfaces.
Over time and mileage, oil breaks down. It loses viscosity, becomes acidic, and its additive package (the detergents, anti-wear agents and corrosion inhibitors blended in at the factory) gets used up. The filter, meanwhile, gradually fills with the debris the oil has collected. Once it's saturated, contaminated oil bypasses the filter entirely and circulates through the engine uncleaned. That's when accelerated wear begins, often silently and without any dashboard warning until real damage is done.
A regular oil and filter change, done at the intervals your manufacturer recommends, is the cheapest form of insurance against expensive engine repairs. It takes under an hour, costs a fraction of what a worn-out turbo or scored crankshaft would set you back, and keeps your service history intact for resale.
Six steps, about 30 minutes, done properly.
An oil and filter change is straightforward work, but doing it right matters. Here's what a good garage does each time.
Drain the old oil
The sump plug is removed with the engine warm so the oil flows freely. Every last drop of degraded, contaminated oil is drained into a waste container for proper recycling. This typically takes 10-15 minutes for a full drain.
Replace the oil filter
The old filter is removed and a new OE-spec filter fitted. The filter's rubber gasket is lightly oiled before installation to ensure a clean seal. Reusing an old filter defeats the purpose of the change, so it's always replaced.
New sump plug washer
The small copper or aluminium crush washer on the sump plug is replaced to prevent leaks. It sounds minor, but a weeping sump plug can lose oil slowly over months and go unnoticed until the level drops dangerously low.
Refill with correct-spec oil
Fresh oil matching your manufacturer's exact specification and viscosity grade is measured and poured in. The quantity varies by engine (typically 4-6 litres) and getting the level right matters. Overfilling is as harmful as underfilling.
Check the oil level
After filling, the engine is run briefly and switched off. After a few minutes for the oil to settle, the dipstick (or electronic sensor on newer cars) is checked to confirm the level sits between the min and max marks.
Leak check and reset
The mechanic inspects around the sump plug and filter housing for any drips or seepage. On cars with a service interval indicator, the counter is reset so the dashboard reminder aligns with the fresh oil.
Six signs your oil needs changing now.
Dark, gritty oil on the dipstick
Fresh oil is a clear amber colour. If yours looks black, thick or feels gritty between your fingers, it's full of combustion byproducts and metal particles and needs changing regardless of mileage.
Oil warning light or low-level alert
If the oil pressure light comes on, stop driving as soon as it's safe. Low oil pressure means the engine isn't being lubricated properly and continued driving can cause catastrophic damage within minutes.
Louder engine noise or ticking
Engine oil cushions metal-on-metal contact. When it's old or low, you'll hear a tapping or ticking from the top of the engine, especially on cold starts. That's valve-train components running without adequate lubrication.
Burning oil smell
A hot, acrid smell from under the bonnet usually means oil is leaking onto a hot surface, or the oil has degraded to the point where it's burning off internally. Either way, get it checked before it gets worse.
Engine running hotter than usual
Oil carries heat away from the combustion chamber and moving parts. Old, sludgy oil does this less effectively, so your temperature gauge may creep higher than normal, especially in traffic or on warm days.
Increased fuel consumption
Degraded oil creates more friction in the engine, which means it has to work harder to produce the same power. If your fuel economy has dropped noticeably without a change in driving habits, old oil could be the cause.
What you'll actually pay in the UK.
The cost of an oil and filter change depends on two things: the type of oil your car requires and the garage's labour rate. The filter itself is rarely more than £15. Oil quality and quantity drive the rest of the bill.
Here's a realistic breakdown of what UK drivers pay in 2025-2026, Actual prices vary by location and garage.
| Vehicle type | Oil type | Typical price |
|---|---|---|
Small petrol (e.g. Fiesta, Corsa) | Semi-synthetic 5W-30 | £80-£110 |
Mid-size petrol (e.g. Golf, Focus) | Fully synthetic 5W-30 | £100-£140 |
Diesel with DPF (e.g. Qashqai, 3 Series) | Low-SAPS synthetic 5W-30 | £110-£160 |
Premium petrol (e.g. A4, C-Class) | Manufacturer-spec synthetic | £130-£180 |
Performance / large engine | Manufacturer-spec 0W-40 or 5W-50 | £150-£250 |
Van / light commercial | Semi or fully synthetic | £90-£150 |
Prices are indicative and include oil, filter, sump washer and labour. Actual quotes vary by location and garage. Compare on BookMyGarage to see real prices for your specific vehicle.
Not all engine oil is the same. Here's what matters.
The numbers on an oil bottle (like 5W-30) describe its viscosity: how thick it is at low temperatures (the W number, for "winter") and at operating temperature (the second number). Lower W numbers mean the oil flows more easily on cold starts. Your manufacturer picks the grade that balances protection, fuel economy and emissions for your specific engine.
Mineral oil
e.g. 15W-40
£4-£8 per litre
The most basic option, refined directly from crude oil. Fine for older, simpler engines with generous tolerances, but it degrades faster and needs more frequent changes. Rarely specified by modern manufacturers.
Semi-synthetic oil
e.g. 10W-40, 5W-30
£6-£10 per litre
A blend of mineral and synthetic base oils. A solid middle ground that offers better protection and longer life than mineral oil at a reasonable cost. Common spec for many mainstream petrol and diesel engines.
Fully synthetic oil
e.g. 5W-30, 5W-40, 0W-20
£8-£15 per litre
Engineered from the molecule up for maximum protection, stability and performance across extreme temperatures. Flows faster on cold starts, lasts longer between changes and is required by most modern engines. The standard choice for anything built in the last 10-15 years.
Manufacturer-specific oil
e.g. BMW LL-04, VW 504.00/507.00, MB 229.51
£10-£20 per litre
Some manufacturers (particularly German brands) require oil that meets a specific approval code beyond the standard viscosity grade. Using a non-approved oil can affect warranty cover and DPF longevity on diesels. Your garage should always check the spec before pouring.
How to find the right oil for your car
Check the owner's handbook. It will list both the viscosity grade (e.g. 5W-30) and any manufacturer approval code (e.g. VW 504.00 or MB 229.52). If you've lost the handbook, the information is usually available on the manufacturer's website or by entering your reg on an oil lookup tool. When booking via BookMyGarage, the quote is matched to your vehicle's spec. Confirm with the garage before they start if you have a less common oil requirement.
While you're at the garage, it might be worth combining.
An oil and filter change is often part of a broader service, so bundling saves on labour. If you're due a full or interim service, the oil change is already included. If you just need the oil done on its own, it still makes sense to ask the garage about anything else that's coming up.
Booking your MOT at the same time means the car only goes on the ramp once, and any issues the mechanic spots during the oil change can be flagged before the MOT tester gets to them.
Full or interim service
An oil change is included in every service tier. If you're close to your annual service, book the full thing instead.
MOT test
Bundle MOT and oil change to save on labour. One visit, one ramp slot, one bill.
Brake fluid change
Due every two years regardless of mileage. Easy to add while the car is already in.
Air filter replacement
A clogged air filter hurts fuel economy and performance. Quick to swap during an oil change.
Oil and filter change FAQs
- How often should I change my engine oil and filter?
- Most manufacturers recommend every 12 months or 10,000-12,000 miles, whichever comes first. If you mostly do short trips, city driving or stop-start commuting, the oil degrades faster and you should consider dropping to every 6,000 miles. Diesels with DPFs and turbocharged engines also benefit from shorter intervals. Check your handbook for the exact schedule.
- How much does an oil and filter change cost in the UK?
- For a standard petrol car using semi-synthetic oil, expect to pay around £80-£130. Fully synthetic oil pushes that to £100-£180, and prestige or performance cars requiring manufacturer-specific oil (like BMW LL-04 or VW 504.00) can reach £150-£250. The filter itself is cheap (£5-£15 typically). Labour and oil quality make up most of the bill.
- Can I use any oil in my car?
- No. Your engine is designed for a specific viscosity grade (like 5W-30 or 0W-20) and often a particular manufacturer specification. Using the wrong oil can cause increased wear, poor fuel economy and even engine damage. Your handbook will list the exact spec. Any decent garage will check this before they start.
- What happens if I skip an oil change?
- Old oil loses its ability to lubricate and protect. It thickens, collects contaminants and becomes acidic, which accelerates wear on bearings, camshafts and piston rings. In the short term you might not notice anything. Over time, you'll get increased fuel consumption, reduced power and eventually serious engine damage. A skipped oil change can turn a £120 job into a £3,000 engine rebuild.
- Do I need to change the filter every time I change the oil?
- Yes. The oil filter traps metal particles, carbon deposits and combustion byproducts. A clogged filter restricts oil flow and forces dirty oil back through the engine. Since the filter costs between £5 and £15 and is already accessible during an oil change, there is no good reason to skip it.
- Will an independent garage void my warranty if they do the oil change?
- No. Under the Motor Vehicle Block Exemption Order 2023, you can use any garage for routine maintenance without affecting your manufacturer warranty, as long as they use oil that meets the correct specification and record the work properly. Keep the invoice and any receipts for the oil used.
- How long does an oil and filter change take?
- Around 30-45 minutes for most cars. The oil needs time to drain fully and the mechanic will check for leaks after refilling, but it's one of the quickest garage jobs there is. Most places offer while-you-wait or will slot it into a broader service.
- Can I do my own oil change to save money?
- You can, but you'll need to dispose of the old oil properly (it's illegal to pour it down the drain or put it in household waste). Most council tips accept waste oil for free. Factor in the cost of oil (£25-£50 for 4-5 litres of decent synthetic), a filter, a sump plug washer and the tools. For many people, the convenience of a garage doing it for £80-£130 is worth it.