"The engine slingers service is a must..." (on a 25K mile bike) - apologies mcsherry1328, this is not directed at you personally, but at the now "11th Internet Commandment" that if not followed, your bike will explode with nuclear furry!
Been working on (as a shop mechanic and hobbyist) and riding /2 and earlier BMWs since the late 60's. As a shop mechanic, THERE WAS NO STANDARD "SLINGER SERVICE"!!! If a bike had a crankshaft issue or needed an engine rebuild for some reason, we would tear it down and clean or replace the "oil throwers" as a mater of course, but I can't recall a single instance of someone coming into a BMW shop (either when I worked at or as customer back in the day) when a service manager told a customer that they should bring their bike in for a "slinger service".
If you look in your period BMW owners manual or service manual, you won't find any recommended "service interval" for cleaning or replacing them. And they are barely mentioned in the BMW workshop manuals of the time other than as part of reassembling your crankshaft for installation back into your motor! Further, if you look at their primary function - throwing oil to the various parts of the engine that need lubrication, they will continue to work even if full of sludge (and they take a LOT of miles with frequent oil changes to fill up). I am NOT recommending that you never address them, particularly in an engine with lots of miles, unknown service history, and an oil pan full of sludge. And if you are doing a ground up restoration, well, standard procedure while the motor is apart. But to scare the heck out of a newbie that if they don't immediately take their new ride apart and spend considerable time, effort and dollars on a "slinger service", they will be left on the side of the road with a melted engine is just bad advice in my opinion. And I understand it is just one guy's opinion at that. That said, BMW used the slinger design for a number of decades and, to my knowledge - I'm sure someone will find a service bulletin somewhere - never suggested taking apart one of their motorcycles just to do a "slinger service".
Oh, and I am not unfamiliar with slinger servicing...
Rant over now.
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