im wondering wat oil should i put seeing im doing a oil change and winter is coming ...right now i have Valvoline 10W-30

 

160k on a 93 Si bought brand new from the dealer. the only oil thats been in it is castrol 5w-30, started using high mileage at about 100k and have had absolutely no issues from the engine. 5w-30 is a very good "most climates" oil, you should have no problem in mass.

 

Can never go wrong with 5w30 royal purple