- Dec 3, 2007
Cars frighten and confuse me.
Hmm, that's different. Clearly your engine is happy with whatever you've been giving it, so there's no point changing now.
Not worth it for most cars. I only use a "premium" (Mobile 1 fully synthetic) in my Chevelle because it sits for long periods and is only changed once a year, where conventional would go bad. I sold my truck with a 350 last year with 225k miles on the clock and only regular oil through it, changing it twice a year (~6000 miles) and it still ran like a Swiss watch.