And now it is time for yet another R4 a/c compressor for my 1984 300SD!! Reman Behr R4 with -o rings, installed 4/2007, R12, 300 visc synth mineral oil. Now it is weak and can not get past 150psi high side after full charge and bubbles in sight glass. (this happened on another R4 I had 5 years ago). another R4 got it cold.

In 5/2006 new R4 with GM sealing washers from ACkits.com, R12, 525 visc mineral oil, lasted 1 year.

In my old 1983 300SD, went thru three R4s with 134A. New and Reman, it does not matter. Brands, I have been thru Delco, Harrison, Behr with both short clutch and long.

My 1995 GMC Sierra truck R4 (top mount, serp belt) is a work horse as is the nippondenso in my 1993 Mercedes W124. I wish we had other compressor options for the pre-1986 W126s..like the denso on the 1986+ 300SDL, 420sel, ect or the A6 on the 380se. I have thought about this alot but mounting bolts and a/c hoses would not match.

Looks like another R4. This time maybe a Murray reman from Oreillys for $152. I hope this one has the 0-rings instead of those dreaded GM sealing washers. Going back with R12. Need to decide on type and visc of mineral oil 150-525visc.

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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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