too many people don't follow the directions - particularly when adding it to the crankcase. It's doing it's job - if your seals suck, and the only reason they weren't leaking bad before was because the oil was sludged up around it, then don't blame it on the cleaner - your seal was bad - replacing it is the only fix. If you don't want it to clean AS well so you can live in blindness about your decrepit engine seals, just leave it in 30 miles like the directions say.

That being said, there is NO way adding it to the fuel or the intake will harm anything.

 

Haha Ive heard the "seafoam debate" many times myself, never used it but maybe Ill give it a shot this time around, never owned anything with even half as many miles. Im replacing a brake line and both front wheel bearings tomorrow, Ill check everything else out while its on the lift. Thanks for all the input and I have a build thread if you guys wanna check my XJ out, got a couple pics. Thread is Project Commando.

 

X-4 on all fluids also flush radiator and change the t-stat as far as my 2cts. buy gumout inj. cleaner with regaine and of course air filter

 

mine has 21122 i used zMAX every other oil change