I'm looking for suggestions for a synthetic oil to switch to. I’m also wondering if I should first switch to a synthetic blend before moving over to full synthetic. Right now I'm thinking about Mobil 1 0w-30 full synthetic. Make: Honda Model: Prelude Year: 2001 Engine: H22A4 (2.2 liter inline 4 cylinder) Oil: Chevron 5w-30 (API SM, I believe, petroleum-based motor oil) Filter: PH-3593A (Fram oil filter) Miles: 98,000 Location: Seattle, WA I'm unsure about certifications that the owner's manual calls for. I've tried to find an online manual but not much luck; I'll have to dig up my manual. I would imagine it’s SL since this model was around from 1997-2001. As far as driving style goes I've been taking it pretty easy lately. Every once in a while other drivers make me push my car as hard as it will go (red lining every shift, which is 7500rpm I believe) but I don't do that too often these days. I drive anywhere from 20 to 100 miles a day, at least 50% of which is on the freeway and at most like 90%. Currently I'm using a petroleum-based motor oil so I've been changing it every 3000 miles. I just went back to 5w-30 from 10w-30. I had been using 10w-30 although the manual says to use 5w-30 because for a while my car seemed to be burning oil and when I tried 10w-30 the oil consumption and black soot on my rear bumper seemed to go away. Now that I've read more about how motor oil works I really doubt that was what happened and I'm leaning towards switching to a 0w-30 synthetic now. Another reason that I am using petroleum-based motor oil for the moment is that it is much cheaper and I just did a Sea Foam before the last oil change. I followed the directions so 1/3 of the bottle went directly into the crankcase and I changed the oil 300 miles later. I just changed my oil again 3000 miles later and my next change I would like to switch to a synthetic for all the reasons anyone would switch to synthetic.