Originally Posted By: ToadU
Follow the OCI monitor. The manufacturers spend millions in engineering. Father knows best so to speak. Just follow the monitor. OCIs in the manual and the monitor are already on the conservative side of the equation. Your driving all highway miles which is very very easy on a power train. Relax my friend.
No they don't spend millions.
Look how many times those intervals have had to be shortened when the engines developed sludge problems.
VW, Toyota, Honda, Chrysler, GM and others have all screwed the pooch in an attempt to appear low maintenance or because of optimistic OLM algorithms.
The engineers have little to do with setting the OCI, they may give the initial recommendation but the marketing dept takes it from there. Engineers would be hard pressed to recommend more than 5K for an engine OCI without knowing the operating parameters of the individual engine.
DI and turbochargers can be very hard on engine oil.