Oil change intervals

It's very simplified, of course. For example, it makes no distinction between a period of ticking over and a period of high RPM darts. The former is 'not too bad' in subjecting the lubricant to mechanical and chemical stress, and the latter is 'bad'. Oil temperature too plays an important part. Nevertheless, it's not without merit. For under £5, a rough idea of the appropriate OCI can be arrived at. It may even be not far from the correct OCI if the driver avoids as much as he/she can driving at too low (< 80ºC) or too high (> 115ºC) oil temperature, idling for too long, or racing the engine.

Oh, this is meant to be the starting point for arriving at the correct OCI. Used oil analysis is required for fine tuning ultimately unfortunately.

Actually the other way round's just as bad in most engines, Engines that operate at a constant rpm & moderate loads often last better.

Some service indicators do a rudimentary oil analysis. M-B for one.

Yes. Prolonged idling can lead to camshaft etc wear.

Because people and fleet managers in the UK can't read?

Every owners manual has a maintenance section for severe conditions and there will be a bit it about doing oil changes more frequently if. You drive short journeys - that's anything less than 15min needed to fully warm the engine and drive off water / fuel from the oil. Extensive idling - like city rush hour where a lot of the time is spent stopped and the rest at low speed. The water temp may show normal but the oil is cooler than it should be. Some water temp gauges have a "dead" zone, normal is indicated at anything between 60 and

I could point you to a few owners web forums with photos of the coked up breather system after the owner has failed to get the oil changed at the correct frequency for their abuse. Typically the car will be fine for a very long time under this low load abuse. It's when they sell it or go on a long M-way trip that it causes problems.

-- Peter Hill Spamtrap reply domain as per NNTP-Posting-Host in header Can of worms - what every fisherman wants. Can of worms - what every PC owner gets!

Or a.... Lets see

Every one a small(ish) blown motor including the the Hayabusa turbo Dax Rush.

FWD owners needn't bother.

Someones put an Audi 2.0 turbo in an Elise for this years time Attack. So it should be able to join the list.

-- Peter Hill Spamtrap reply domain as per NNTP-Posting-Host in header Can of worms - what every fisherman wants. Can of worms - what every PC owner gets!

Peter Hill wrote in news: snipped-for-privacy@4ax.com:

Celicas are FWD these days, unless your list refers to the old GT4 model?

Stu

You won't be wanting to do any of those tracks in a straight line...