I am changing the compressor out on my 86 300sdl because the old one started leaking oil. I am going to refill the system with the recovered r12, not r134a so i will need to use mineral oil. My question is can I just use freeze 12 brand mineral oil or do I need to try and source the recommended nippondenso ND-6 oil? I can't seem to find the ND-6 oil anywhere.