Just wondering what type or kind of additives that enhance engine/ auto transmission performance and extend its life ! there is a lot of things to shop from and i hate too much choices , i am hopping someone could help me out and tell me whats best

high quality synthetic oil

royal purple synthetic oil

i can get you a case for 70 bux

i switched to redline for my ATF and there was an immediate difference in the transmissions performance. then about a 2 months ago i added 1/2 ounce of transmission seal sweller to the fluid and that made a BIG difference in the firmness of the shifts. i guess my seals were leaking a little and not holding pressure as well as they could have been, i'd never thought there was a problem since it always shifted smoothly. i just tossed a little in for the heck of it to see if anything changed and that little amount sure did make a change!