Royal purple oil change special 35$
#16
Has anyone tested the new RP HPS? Maybe find the zinc/phos content?
http://www.royalpurple.com/product-c...!hps-motor-oil
http://www.royalpurple.com/product-c...!hps-motor-oil
#17
The RP HPS looks pretty good in zinc, phos and moly.
http://forums.corvetteforum.com/c3-t...nd-others.html
Cost per quart looks to be 9-10 bucks.
http://forums.corvetteforum.com/c3-t...nd-others.html
Cost per quart looks to be 9-10 bucks.
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