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.

If you want to be strictly R12 compatible, you can refill with mineral oil. If you want to future-proof yourself, you can go with PAO oil which is compatible with both CFC and HFC refrigerants.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Ok so regular mineral oil should work instead of ND-6 oil? I have some on hand and would like to use it but dont want to hurt the new compressor.

Mineral oil works fine.

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Jim