Quote:
Originally Posted by jkv357
That's more of an engine test than an oil test IMO.
If the coolant, oil, and combustion chamber temps are safe and stable, and engine should be able to run at WOT for a long, long, time - no matter what oil is in it. Excess heat build-up is a big problem, that's an engine design issue, but most engines aren't designed with extended WOT running in-mind. That engine was started cold once, and ran directly up to (maybe beyond) operating temp and sat there.
Most of the time our engines operate closer to that scenario than the "Maximum Endurance Test" one.
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If they tested the engine why do they say; "until the oil is compromised". (perhaps they changed 3 or 4 engines before the oil was compromised in the test at 148 hours (completely 148 hours with 3 or 4 engines with same oil!)) who knows!?-thats why you have to test it yourself.
"Extreme Conditions" to me means having a car sitting outside in winter temps, running to the store or work 2mi away, turning it off, starting it up, and driving back. That's what contaminates oil and shortens your change interval.
This theory i dont really believe it. They say so but as soon as you turn the car on the oil will be heated up, small amount of water perticles will be removed (evaporate). Although water does not mix with oil but even if it stays in the oil that is a very small amount of it. That is almost zero. If huge amount of water or coolant will mix with oil then you have a serious problems and need to replace teh oil with new one. Oil does not allow metal to condense water. The walls of engine are sealed by oil so even if water particles mix with oil that will not present a danger for the oil.