PP in a Honda Civic. Mine is a 1.7 and I really like the protection and things I hear about PP, but I feel like the engine has not been as efficient on it, and the mpg have dropped. I have 5w20 in there, and stocked up on PP, but was thinking about going to something thinner like MC 5w20. It's not like it's a drastic loss in MPG, maybe 1 or 2 at most. Has anyone else had this problem in their engine, or think that I am sacrificing anything if I go to MC 5w20? Do you think I should just use the remaining PP then switch? I have enough for about 2 more OCI
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