Oil Change Basics: When and Why You Should Care

Every driver hears the word "oil change" a lot, but not everyone knows why it matters. Fresh oil keeps your engine lubricated, cool, and clean. When oil gets old it thickens, loses its grip, and lets dirt settle inside. That can cause wear, higher fuel use, and expensive repairs.

Most manufacturers recommend an oil change every 5,000 to 10,000 miles, depending on the type of oil and how you drive. If you do a lot of city stopping, tow heavy loads, or drive in dusty conditions, lean toward the shorter interval. The easiest way to stay on track is to note the mileage after each change in your phone or car log.

How to Spot That Your Oil Needs Replacing

Before you hit the garage, check a few tell‑tale signs. A dark, sludgy appearance on the dipstick usually means the oil is breaking down. If the engine makes a louder knocking sound, the oil might not be lubricating enough. Also watch the oil pressure warning light – it’s there for a reason.

Another quick test is the oil smell. If you notice a burnt odor when you open the hood, it could be a sign the oil is overheating. These clues help you avoid waiting until the next scheduled service.

Choosing the Right Oil and Filter

Not all oil is the same. Conventional oil is the cheapest, but for most modern cars a synthetic blend gives better protection at a similar price. Full synthetic oil lasts longer and works better in extreme temperatures, but it costs a bit more.

The oil filter catches metal shavings and dirt before they reach the engine. Always replace the filter when you change the oil – it’s cheap insurance. Look for a filter that matches your car’s make and model. Most auto parts stores have a quick lookup tool to help you pick the right one.

If you’re buying oil yourself, read the label for the viscosity rating (like 5W‑30). The first number tells you how the oil flows when cold, the second how it behaves at operating temperature. Your owner’s manual will have the recommended range.

DIY Oil Change: Simple Step‑by‑Step

Doing it yourself can save you money and give you confidence that the job’s done right. You’ll need a few tools: a wrench or socket set, a drain pan, a new oil filter, the correct amount of oil, and a funnel.

1. Warm up the engine for a few minutes. Warm oil drains faster. 2. Lift the car safely with a jack and stands, then locate the drain plug under the oil pan. 3. Place the drain pan, loosen the plug, and let the old oil flow out completely. 4. Remove the old filter – it’ll still be full of oil, so be ready for a spill. 5. Lubricate the new filter’s rubber seal with a little fresh oil, then screw it on by hand until snug. 6. Re‑install the drain plug, making sure it’s tight but not over‑torqued. 7. Pour the new oil in through the filler cap using a funnel. Check the amount against the manual. 8. Start the engine for a minute, then turn it off and re‑check the oil level. Add more if needed.

After the change, clean up any spills, dispose of the old oil at a recycling centre, and record the mileage. You’ll know exactly when the next change is due.

When to Let the Professionals Handle It

If you’re not comfortable working under the car or you have a newer model with a hard‑to‑reach filter, a shop is the safest choice. Professional mechanics have lifts, quick‑drain pumps, and proper disposal methods. They can also spot other issues while they’re in there, like a leaking gasket or worn seals.

Most garages charge for oil, the filter, and labor. The price varies, but it’s usually less than £70 for a standard service. Look for a reputable place that uses the right oil spec for your vehicle. Reading online reviews or asking friends for recommendations helps you avoid cheap, low‑quality service.

In short, regular oil changes protect your engine, keep fuel costs down, and prevent costly breakdowns. Whether you DIY or visit a shop, stick to the recommended interval, use the right oil and filter, and keep a simple log. Your car will thank you with smoother rides and a longer lifespan.