I'll second the importance of doing a compression rest. Blowing oil could be a stuck pcv valve, but it could also be bad rings which would mean a full rebuild. (I just went through this on mine)
Change the oil. Get a wix filter. I believe part 51515 but someone correct me if im wrong.
You are correct, the filter is 51515. Avoid orange can fram filters whatever you do. Also use 10w-30 motor oil, it is sufficiently slippery and your oil pump drive gear will apreciate it. Use a zinc additive too.
I also am leaning torwards the compression check because for some odd reason my head tells me you have a blown head gasket and thats your cooling issues.
