Posted this question in my rebuild thread, but with no responses I'll make a separate thread for this.

Why is it that the FSM specifies and emphasizes to NOT use engine oil on the o-rings during injector installation. I see witchhunter says you can use that, but I haven't been able to figure out why the FSM has that statement in there. Any injector specialists out there who knows the answer to this?

 

engine oil will swell the injector o rings. i think they say to use petrolium jelly on them.

 

i will correct myself, it says to apply gas to them before installation. not petrolium jelly. but as i said before engine oil will swell the orings causing them to leak or tear after installation.

 

i used motor oil seems to be fine i dont think its that big a deal. Or just use gas to be on the safe side

 

petrolium jelly is the way to go
i tryed twice with gas and had leaks

 

i just did mine after i got my injectors cleaned. used petroleum jelly. did the same on the supra, no issues with either thus far.

 

i didn't use anything. so far 4k+ miles and no leaks.

 

I read something somewhere where they suggested that the note in the FSM is a product of a bad translation. Even witchhunter suggests engine oil on their website, so I guess it can't be that bad. I hope it's not since I discovered the note in the FSM after I had installed the injectors using engine oil