Thanks. I'm going to run some seafoam through the brake booster line and dump the rest in the crankcase to flush it out. I definitely agree with you on synthetic. I plan to switch both my vehicles over to it. I almost bought a 96 F250 w/ a 460 that had 320,000 miles on the original engine. The guy ran mobil1 through it since he bought it with 60,000. I was impressed with that.