on the 3 grps i ran through the past year alls i used was odo plugs. coming from you il take the word as the gospel. i never had a leak and everything i ran, of which were rebuilds that had good lifespan. but i also have to say that i was told not to run os plugs in jammin jpx engines and have been doing so with great success. in my area everybody has ran the same odo plugs as i have...exept for 1 out of a good dozen that i know that ran an os p3(only 1 grp ran on os and was fine). im not about to argue with mr. losi...no doubt....considering youv ran grp longer than i have..i am waliking away with your word!...its all just a shame that grp has dwindled into what it has....