hey guys i used to have a 00 civic si with gsr motor and greddy turbo kit. the manual called for 5w30 but i was using 10w30 and never had a problem and that was recommended by the tuner and mechanic. but now i own an 06 GSR IX and it calls for 5w30 by manual. i live in ct so temp gets cold in winter.. what brand of oil should i use and what weight and viscosity should i use for a new england state...the civic tuner even recommended conventional oil rather then synthetic

 

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Seriously.

 

PS Use synthetic

 

Use a synthetic what?

 

Windshield wiper fluid.

 

5w 30 fully synth