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Registered
Join Date: Jun 2008
Location: Ontario, Canada
Posts: 2,145
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I'm indifferent about the 20w50 not being necessary for a street car. Like I said, I get more lifter noise in hot weather with a 10/40. My personal opinion is 20w50 in warm and hot, and 10/40 in COLD. Not spring or fall cold, but below 10 cold and into the negatives.
However, I do believe that a vr1 racing oil, although I can't recall what kind of additive pack it has, does not have good properties for street use. For example, look at the swepco 502 additive pack and. An amsoil zrod. They have detergents and anti corrosion inhibitors necessary in a street driven car.
Vr1 is a great track oil though from the research I have done.
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