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Originally Posted by jmsspratlin
So you are saying that the diesel oil would provide a longer life for the engine overall, than say if I ran Mobil 1 the life of the engine?
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Not necesarily, but it can't hurt, is what I'm trying to say. I haven't seen a good comparative analysis of major oil brands since 2003. However, I had read a tech bulliten published by the Porche Car Club of America which cast doubt on the ability of modern gasoline engine oils to protect their beloved air-cooled pancake-sixes. A lot of 911 owners run Rotella 15-40 (non-synth) in their vehicles. a 911 holds a little over two gallons and most owners like to change often.
Mobil 1 stacks up good, if you like it, there's no need to switch.