Longlife servicing: is it worth switching to fixed intervals?
Variable servicing was designed for high-mileage motorway cars. Most cars are not that.
How Longlife works
The car estimates oil condition from mileage, fuel consumed, engine temperature and load, then sets a service date up to two years or around 18,000 miles away. It requires a specific Longlife-approved oil and a larger fill quantity.
Where it works well
A car covering 15,000 motorway miles a year keeps the oil hot and clean, and the extended interval is genuinely justified. Fewer services, no penalty in wear.
Where it does not
A car doing 6,000 short urban miles a year can reach the two-year limit with oil that has spent its life below full temperature. The additive package is exhausted long before the date arrives, and on engines with known chain wear that is where the trouble starts.
Switching over
A dealer or independent with the right diagnostic tool can change the service regime to fixed intervals, typically 10,000 miles or 12 months. The oil specification usually stays the same, so the only real cost is more frequent servicing.
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