No additives!!! They won't work for long if at all. I'm gonna start sounding like a broken record here.... But what kind of intake gaskets are you using? You NEED a Steel core intake gasket. OEM's had Steel core i believe but those 1250, 1262 etc. WILL eventually leak. I thought i had a head gasket leak too at first. But you will probably find out its just the intake gasket.
Heres what i just went threw...My intake water crossover leaked inside the motor. I lucked out and caught it before the milkshake seized my motor.
http://www.stangnet.com/mustang-forums/threads/help-coffee-colored-oil.861520/
Heres what i just went threw...My intake water crossover leaked inside the motor. I lucked out and caught it before the milkshake seized my motor.
http://www.stangnet.com/mustang-forums/threads/help-coffee-colored-oil.861520/
yup, and they rent the block testor too. grab the tools and leave your cash. bring it back when your done and it is zero strain on your wallet. just did it last month.
hope you have a heated garage. i did similiar work on my old ranger in the barn years ago. fun it was not.
Yeah i bought the Fel-Pros 1262s-3 and paid around $33 They are made be Fel-Pro anyways. Make sure they say s-3 though. My Gaskets came with cork ends. But i use a thick bead of Black RTV to seal my intake in the front and back and have never had an issue. I also use a thin amount of the RTV around the water ports on both sides of the gasket. I let it set overnight after assembly too. "Just to make sure" Its not a job i enjoy repeating.