What should the compression be on a 4.0? Trying to figure out why I can't stop the oil from getting into my filter box. Mine is running around 125, but it may be a head problem.

 

120 to 150 give or take 30psi.

Have you checked ccv system? Oil coming out of dipstick tube?

 

how many miles, valve seals may be wore out.

 

Yep, comes out the dipstick, ccv system is open, tried buying the groumets, but you have to order them, engine is supposed to have around 160K on it, just put new rod bearing in it the other week, did noyice while doing that that most of the pistons fell down freely, night need rings?? but that could also mean that the MotorKote is doing it's job.

 

Stock air box or something aftermarket?

 

Stock air box

 

yea someone else that knows about motorkote

some reading

https://www.google.com/search?q=oil+...hrome&ie=UTF-8

 

REAL GOOD STUFF!!!! right on

 

im a truck driver and its was hard to swallow spending 100 bucks for a gallon but kept hearing about it on trucking radio, so bit the bullet, oil temp went down 15 to 20 degrees
ive used it in the jeep and also use the spray too. Dont spray that stuff on plastic it eats it alive but it takes like a week

 

What year 4.0? No smoke out the tailpipe?

 

Heck, I use it on everything. Just used it on my rear wiper motor. Would stick in one spot most of the time, sprayed it inside and let it set, put it all back and now it goes like crazy.

I MotorKoted my whole Jeep, front to back, top to bottom. Fantastic stuff, whish I knew about it a few years ago. Yes it is expensive, but a gallon goes a long way, after the first dose. WalMart has it by the quart, 26 with a $5 rebate, almost cheaper the on line.

 

1990, No doesn't smoke out the tail pipe, going to have to order the two groumets that are in the valve cover, then if that doesn't stop it then the head will be changed along with the lifters

 

gallon is a one time use in a semi truck that holds 12 gals