Hello all, I'm a newbie to the site and have been reading and becoming obsessed! I went to a shop the other day to get my first oil change from FF at 3453mi. (OLM) 50% on a 2010 Civic Sedan, which specifies 5-20. Getting to the point they only had PYB 5-30. I asked and he said no problems with warranty, so I got it. Mistake? I Do have the hot FL summer kickin in. Was this guy Honest with me. Am I gonna have probs if there were to be an engine failure. Thanks In Advance. BTW: About 70/30 Highway/city respectively.