This is about the Dakota in my signature. I have to change out my spark plugs tomorrow. I did a tune up not long ago but now I have valve cover gasket leaks and I can smell hot oil when I shut off my engine. Tomorrow I will be changing the vc gaskets along with new plug wires and plugs. I do not know just now if the plugs are damaged, but I had a no-start problem this past Sunday so I am changing the plugs and wires for peace of mind and to be sure I fix the vc gasket problem correctly. I remember the new plugs went in pretty tight when I did my most recent tune up. The old ones were tight to remove as well, I was praying they were not stripped. I believe the tightness may have been from my liberal use of anti-sieze over the years. I have since learned about spark plug thread chasers and picked up one at AAP today. I can't find much info on using it though, other than to "thread it in and turn it back out". Some say use lubricant on the chaser but what kind? WD-40? Kroil? Spray silicone from a can? I also read to put a little grease on the chaser's threads to trap the particles it cleans out. I want to do this right without stripping the spark plug threads. My engine is old school Mopar, it has a cast iron block and also has cast iron heads. Any info on the chaser technique is very much appreciated. Thanks for your help.