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Mercedes-Benz 420SEL Compressor Repl.

Buick8 on Fri May 15, 2009 4:27 PM User is offline

Year: 1986
Make: Mercedes-Benz
Model: 420sel
Engine Size: 4.2L
Refrigerant Type: R134-A
Country of Origin: Germany

Hi, I am replacing my car's compressor (Nippondenso) due to a badly-leaking seal. I am considering converting it back to R-12 due to the marginal performance it has always had after being retrofit to R134-A. Question: is the compressor lubricant used in the conversion compatible with R-12?
Also: I do not know which type of lube was used in the conversion to R-134-A; are both types (ester and PAG) compatible?

Chick on Fri May 15, 2009 5:20 PM User is offlineView users profile

Ester is compatable, but not PAG.. And when it comes to ester, I would only use the best quailty ester, such as BVA Auto 100 (now with dye) as I have been using it for years with NO problems, I switched from R134a back to R12 in my own truck a couple years back, now my friend owns it and it still runs quiet and no leaks. Thats on an R4 compressor no less... But as far as your car, I would flush the system of whatever oil you have, use the BVA, and you could switch back to R134a whenever you want.."Change the drier" of course.. hope this helps..

Email: Chick


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