I think they sell it at auto zone but I got it from
www.summitracing.com. Their are 3 different shockproofs, Superlightweight, lightweight and heavyweight. I have heard heavyweight is the best but can be a real pain to shift in cold weather when it not fully warmed up. I use lightweight and so far am very satisfied.
http://www.redlineoil.com/products_g...61&subcatID=20