My 1992 Acura legend is my baby with 176,000 miles and I'm really trying to see what I can get out of it for performance. I'm working on putting in a new air intake and a new exhaust system but before that, I'm ready for an oil change...My friend told me to switch over to synthetic oil to help clean out the engine and get it running better. He told me to change the oil with synthetic for like 3 oil changes then continue with a synthetic blend. I'm willing to pay the money for it but should I switch over to full synthetic? If not, what should I use for performance?Thanks for your help! It's really appreciated!Well thanks for your answers...Yes it is a 92 and yes it does have 176k miles on it but its an engine that will last another 100k to 150k if taken care of well. The body is still in good condition so why not fix it up? I'm not asking for a racing beast or anything, just something where I can punch it and it has a really good kick to it...ALSO oil does make a huge difference in a car's performance...I'll stick with 5w-30 mobile 1