The conversion was done recently by a professional, and yes, he had flushed the whole thing and out in the new oil. But there was a leak, and we did not know how bad it was until after the conversion. It cooled rather well for a couple of weeks until the system was dead empty, so I was not too disappointed with the 134a's performance while it lasted.
Well, with dye and the whole chazam we found one bad hose and the dreaded expansion valve. Those are the items I am fixing this week before refilling the system. That's why I need those oil numbers.
I did check
www.airconditioning.com, and found nothing there yet, though my check was not the most thorough. Since there are so many Benz people here, I thought someone might know the exact number....
Thanks!