Quote:
Originally Posted by chris719
I don't know, as someone who reads the bobistheoilguy.com forums, I thought it was a bit light on detail.
I am also not sure that their broad characterization of the different group base stocks is totally accurate. RL has a vested interest in pushing their oil, and Group V base stocks are their "thing".
They also didn't do a great job of explaining that while a 0W-30 is a 0 at 0C and a 30 at 100C, the "0" rating is not a fixed viscosity, it's a point on a curve. Even at cold temps, a 0W-30 is never thinner than it is at 100C, so it can't possibly be too thin if a 30 is the correct weight at operating temperature.
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The viscosity and density of a 30W is tested at 100C - Yes. Although, both viscosity and density continue to drop (oil gets thinner) as the temp increases. The curve flattens but it certainly gets thinner at say 110C vs 100C. My BMW oil temp runs around 230F-240F not the 212F (100C) as tested. Therefore , I chose 5W-40 to help accommodate the higher oil temps and DI fuel dilution.