So I had a misfire, so I pulled the plugs and one had oil on the coil and top of spark plug. So obviously means I gotta change valve cover gasket and plugs seals. So I opened it up and OMG the most sludge ive ever seen. Not hard stuff but gooey slime black and stinky no pudding no milk color just black slime. So I scoop it out tooth brush it out seafoam and parts cleaner and managed to get most of it out. I put everything back together with a new gasket set new plug and coil cause of the oil. so I'm thinking next I pull the filter and oil pan and clean all that out, do I need a oil pan gasket or can I just use some rtv? Anything else I should do or look at? Car has never been down on power or had any issues beside oil and coolant consumption. Now I know the oil issues. Car has gm stage 2 a zzp mid lenghth header and downpipe. A vibrant catback exhaust a CAI and a tune that's about it so far. Any help or pointers are welcome ill try post a pic of sludge I never took a after pic cause it was dark but got a good before. Terrible stuff.