Are you sure on this? My '86 300SDL came with R12 (and still has it) and so have all the other 300SDLs I have seen.

I thought MB didn't start putting R12 in as a factory fill until the early 90's. Perhaps yours was converted?

I was under the impression *ALL* SDL's had R12 and should stay that way for best cooling performance (R12 is getting cheaper by the day now..)

Neal

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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)