Re: Oils other than Mobil1?
Here's what I know ...... oil is a petroleum product and will break down with use and time...... Mobil 1 (and others) is an oily feeling lubricant, and doesn't break down under normal engine operating temps, but will get dirty like Petroleum based oil. As far as I know, if a synthetic oil is kept sealed in a bottle, or in an engine, and not exposed to moisture, it can last a long, long time.