He is correct. Time and mileage are contributers. Low kms over long time is considered the worst as this implies lots of stop start driving. At start up there is a good amount of condensation and nasties that work their way into the oil. One main by-product of combustion is also sulphur.
Short stop start trips mean your car never gets up to full operating temp where a lot of nasties are burnt off and the moisture is evaporated. Some cars are seen to gain oil volume and this is why. Now when you mix sulphur and condensation you get sulphuric acid, great for the bearings etc. This is especially apparent in diesels.
Cars that travel higher kms in shorter periods can go longer before the oil becomes sufficiently degraded as the higher kms imply longer trips, and higher likelihood the nasties are burnt off.
Originally Posted by Breeze
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