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On your 95 R129, I guess I wouldn't worry as much about having synthetic in it. You COULD do it if you wanted.
The thing about the 112 and 113 engines is that the piston rings are very light tension and are more affected by any varnish build-up than the earlier engines, this is to increase fuel mileage. MB really wants synthetic in these 112 and 113 engines.
Gilly
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