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1 5 stars by Geoff T. out of on January 9th 2019
JR 4.0 5/20W Full Synthetic 1 quart
Length of ownership: more than 1 year
Pros: In nearly 40 years of racing, hands down the best oil I’ve ever used. Made more power on the dyno ever time we backed to backed it. In some in unusual circumstances (nearly two full passes at very low oil pressure), protected enginevand bearings. Holds up well and keeps performing after many, many pulls / passes.
Cons: If I run out, I can’t buy it at Autozone...but I can easily get it online now !
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