Quote:
Originally Posted by 21rouge  Scanning through BITOG I see only one Used Oil Analysis of this direct injection engine in a Cadillac for any oil...let alone RP  . The question posed by the OP cannot be answered with any degree of expertise until there is a body of analyses. |
Sorry, didn't mean to imply the UOA tests I reviewed were on a direct injection Cadillac. My reviews pre-dated that engine (by several years). However, I really don't think that how an oil compares in one engine family will be that much different than in another and there are enough UOA on that forum from RP or Mobil 1 to draw your own conclusions.
And my perspective on why GM uses Mobil 1, or how ExxonMobil blends Mobil 1 are on the side of those that believe that in these large corporations, the bean counters drive decisions. From that perspective, while I believe that ExxonMobil probably could make the best oil on the market, I don't see why they should when everyone believes that it is good enough and their profit margin is higher if their additive package is less robust, or they blend down their Group IV PAO synthetic basestock with some Group III highly hydroprocessed mineral oil synthetic basestock.
I recognize that most will consider me biased, but I too used Mobil 1 at one time and went through the same considerations as those expressed on this thread several years ago. I started using AMSOIL before I learned that I could sell it.
