An oil and filter service is one of the most important routine maintenance jobs you can do for your vehicle. It’s not glamorous, it doesn’t make headlines, but neglect it and you could be looking at serious — and seriously expensive — engine damage. Yet many drivers aren’t entirely sure what the service actually involves, or why it matters so much.

At MnF Motors, we’ve been carrying out oil and filter services on every make and model of vehicle for well over 25 years, right here in Edmonton, N18. In that time, we’ve seen first-hand what happens when oil changes are skipped or delayed — and it’s never pretty. This guide breaks down exactly what happens during the service, why each step matters, and what to expect when you bring your car to us.

What Does an Oil and Filter Service Actually Involve?

The term “oil and filter service” is sometimes used loosely, so let’s be precise. A proper oil and filter service — the kind we carry out at MnF Motors — involves the following steps:

1. Draining the Old Engine Oil

The process begins by warming the engine slightly so the old oil flows more freely. The mechanic then safely raises the vehicle, removes the sump plug, and drains the used oil completely into a collection vessel. Old oil is dark, thickened, and laden with metal particles, combustion by-products, and contaminants — none of which you want circulating around your engine any longer than necessary.

2. Removing and Replacing the Oil Filter

The oil filter traps particles and debris that would otherwise score and wear your engine’s internal surfaces. Over time, filters become saturated and lose their effectiveness. During a service, the old filter is removed entirely and replaced with a new, manufacturer-specified filter — not a generic alternative. This is a detail that genuinely matters: the wrong filter can affect oil pressure and engine protection.

3. Refitting the Sump Plug with a New Washer

Once the old oil has fully drained, the sump plug is refitted — typically with a new copper or aluminium sealing washer. Reusing an old washer risks an oil leak, which is why a quality service always includes a replacement washer as standard. It’s a small component, but skipping it is a common shortcut taken by less thorough operators.

4. Refilling with the Correct Grade of Fresh Engine Oil

Fresh engine oil is then added to the correct level using the grade specified by your vehicle’s manufacturer. This is crucial — using the wrong viscosity or specification can affect fuel economy, emissions, and long-term engine health. At MnF Motors, we always cross-reference your vehicle’s make, model, and engine against manufacturer data before selecting the oil. Whether your car requires 5W-30 fully synthetic, 0W-20, or another specification, we use exactly what your engine is designed for.

5. Checking the Oil Level and Inspecting for Leaks

After refilling, the engine is run briefly to circulate the new oil, and the level is then rechecked on the dipstick. We also inspect beneath the vehicle to confirm there are no seeps or leaks from the sump plug or filter housing. This final check costs nothing extra but prevents you from driving away with a developing problem.

6. Resetting the Service Reminder Light

Many modern vehicles display a service interval warning on the dashboard. As part of the service, we reset this indicator so it accurately reflects the fresh oil and filter — giving you a correct countdown to your next scheduled change.

Does an Oil and Filter Service Include Any Visual Checks?

At MnF Motors, yes — it does. While an oil and filter service is not the same as a Full Car Service, we believe in giving customers useful information every time their vehicle comes through our doors. When your car is on the ramp for the oil change, our mechanics take the opportunity to perform a brief visual inspection, which typically includes a look at:

• Tyre condition and pressure — obvious damage, uneven wear, or low pressure
• Brake pad thickness — a visual estimate of remaining pad life where visible
• Coolant and washer fluid levels — topped up if needed
• Any obvious fluid leaks from other components visible from under the vehicle
• Belt condition — a quick visual check for obvious cracking or fraying

If we spot anything that needs attention, we’ll tell you plainly — no pressure, no upselling, just honest information so you can make an informed decision. That’s how we’ve maintained a 4.9★ Google rating over 25 years of trading.

Why Is an Oil and Filter Service So Important for Engine Health?

Engine oil serves multiple vital functions: it lubricates moving metal parts to reduce friction, helps dissipate heat, carries away contaminants, and protects against corrosion. Over time, oil degrades thermally, becomes contaminated with combustion gases, and loses its viscosity. A filter that has reached its capacity can no longer trap new particles — it may even bypass dirty oil directly to the engine.

The consequence of neglected oil changes is gradual but accelerating engine wear — increased friction, greater heat, and ultimately premature failure of components like camshafts, bearings, and pistons. We’ve seen engines written off entirely because of nothing more than chronically skipped oil changes. It’s one of the most avoidable forms of mechanical damage there is.

Keeping on top of oil changes also helps protect you if you ever need to make a Warranty Claims on your vehicle. Many warranties — manufacturer, extended, or otherwise — require documented evidence of regular servicing. A missed oil change could invalidate a claim entirely.

Is an Oil and Filter Service the Same as an Interim or Full Service?

No — and this distinction is worth understanding clearly:

If you’re not sure which level of service your car needs right now, give us a call on 020 8088 3150 and one of our team will give you a straight answer based on your vehicle’s age, mileage, and history — no obligation whatsoever.

Should I Get an Oil and Filter Service Before My MOT?

While oil condition