Best oil for alky? Wear? Hp?

gregsdart said

Yellow rose, as a last (15th) dyno pull on my 528, i dumped the reg oil and tried Mobile one, same vicosity. I lost 15 ft lbs of torque, and didn't have a clue why. I thought i should test it at the track too, car slowed down. Is Mobil one a class4 or 5 ayn?

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That's a good question and I don't know. I'll look around and see if I can find out. I know that when Torco decided to develop synthetics they bought a bunch of technology from Mobil and Stauffer chemical to reduce the learning curve.

I'd suspect you got a group IV base and you gave up some ring seal. Did the oil look funny when you drained it out? I've seen the Viscosity Index Improvers come out like plastic.

Which Mobil oil was it exactly?