I've been wondering the same thing. Summit Racings' west coast warehouse and showroom is here in Reno. They have every Redline product on the shelf except the 5W-40 and 5W-20. I asked about the 5W-40 and they had never heard of it. It also seem to be MIA on the site sponsors site.
I think you guys who are saying you are using this stuff are pulling our legs.
Ed
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