Is fully synthetic oil worth the extra cost?

For most modern engines, yes — and many actually require it. It protects better at temperature extremes and lasts longer, which often offsets the higher price over the interval.

Can I switch to a cheaper grade of oil?

Stick to the grade your manufacturer specifies. Using the wrong grade can reduce protection and, in some engines, cause real problems.

How Often to Change Engine Oil (UK)

Engine oil does more than lubricate. It cools, cleans, seals and protects the most expensive component you own. Letting it degrade is the single most common way owners quietly shorten an engine's life.

Interval depends on the oil — and your driving

Semi-synthetic: roughly every 6,000–9,000 miles for typical mixed UK driving
Fully synthetic: 10,000–12,000 miles or more, but lots of short, cold trips pull this shorter
Always use the exact grade the handbook specifies — modern engines are fussy

Read the dipstick

Healthy oil is amber to light brown and translucent. Gritty, jet-black oil well before the interval suggests heavy soot loading — common with a lot of short, stop-start driving — and points to a shorter change interval. A milky, mayonnaise-like film is more serious and warrants a check for coolant getting into the oil.

How Often Should You Really Change Engine Oil?

Interval depends on the oil — and your driving

Read the dipstick

Frequently asked questions