PB Blaster is best but ATF works great. I just got a 2.5 that is stuck. Used PB and in a few days it was moving, but only about 45 degrees. It had water (gallon or so) in the crankcase so it is tough to get. I started filling the crank case with all my used oil and ATF (used cause the engine is probablly bad) and plan to fill it to the top and let it sit for quite a while to see if it will loosen up.
