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Originally Posted by shipo
I was working at Mercedes-Benz when they were developing their OLM system for synthetic oil, in the end the engineers determined that there was just a single metric that needed to be measured to determine when the oil should be changed. The metric? The number of liters of fuel used since the last reset. FWIW, BMW determined the same thing and that is the only metric they use as well.
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Fuel consumption is based on engine load and average engine speed. Since the modern engines keep pretty constant temps and have a pretty clean air filter. Fuel consumption would be a good method ---- and since BMW and MB did the lab testings..