Originally Posted by OilUzer
Q:
If price was not a factor, would you still use the same engine oil that you are currently using?
No - in that case I'd be finding the lube (via testing various choices) that gives me the longest OFCI still producing acceptable wear rates.
The oil I use now gives me the best ROI. But that's not the same thing as the longest safe OFCI.
Example ...
Right now, the best ROI I can get is from $1.79/qrt RK conventional lube; has been shown repeatedly in my UOA data to safely go to 15k miles in my applications. Low wear, good contamination control, no sludge.
However, it's quite possible that other more costly lubes are excluded from my use, because while they may create a longer OFCI (perhaps 2x longer; to 30k miles), they cost 3x or more money. Hence, the ROI is better with the less expensive lube, being changed more often.
But in your scenario, if there were no cost objective, then I would pick the lube which gives the longest OFCI while still meeting the low wear, good control and no sludge.
However, that's not reality, so isn't this just an exercise in futility?