Hey I figure this would be a great first post. Last night I bought a 94 corolla 7afe with 291,409 miles on it. Did a compression test this morning after warming it up. 217,207,205,175. I figure why not experiment and see if any cleaners could bump number 4 up to snuff. Since I have good before numbers nows the time to find out. My usual go to is Seafoam...but Ive been thinking of giving gumout a try. Any suggestions? Oil looks well. Ill probably just use supertech stuff from walmart when I change it. The car is just a beater. I run Amsoil in my main cars.