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Hello John
Good observation - when referring to upsetting modern emission systems, I was assuming that Opie had the ZDDP in engine oil in mind at that point in their comment. It has been reported that zinc (the ‘Z’ in ZDDP) and phosphorus emissions may damage catalytic converters.

Hello All, I'm replying to my own original posting having found the the answer to my query, and in case anyone out there would be interested in that answer. It seems that the Fuchs Silkolene V-Twin 80W-90 transmission fluid is considered ideal for a R1100S. The "specially formulated for Harley ...

I find myself with two litres of “Fuchs Silkolene V-Twin 80W-90 semi-synthetic extreme pressure transmission fluid Maintain”. While the oil classification matches that recommended for the R1100S (i.e. SAE 90 API class GL 5) it also says on the container "specially formulated for Harley Davidson...

Final word - I drained the oil from the housing into a measured container. The amount that came out was 250ml. After a few hours to ensure that all the oil was indeed out, I replaced the drain plug and poured the oil back in. It filled exactly to the bottom edge of the filler opening. So the oil tha...

Thanks 2Twins and Simon - all very helpful suggestions. In fact a bashed-up knee has been preventing me tackling the matter but I hope to get down to it next week, better informed now with your helpful thoughts. Robin.

Hello I have a 1998 R1100S - cat removed, rechipped, Vanderlinde exhaust system. 45,000 miles from new. Reliable machine, good ride. Parked it in workshop in October, all OK. Ran it on stand for 7-8 minutes in November, all OK. In December noticed oil seeping from black cap on top of rear axle housi...