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Thanks for the feedback and my bike is getting close to the 30k mark so it is planned for the end of our Canadian riding season.

I will be prepared for dissembling but maybe tempted with the “Dump and run” if able to extract 99% of the oil. And yes, the Left fork concerns me too.

Also planning to clean and lubricate the seals additionally as an interim step with forks on the bike between the Fork oil change.

Great thread.
 
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Discussion Starter #102
Looking at Dave Moss's answers to questions on his dump-and-run videos, he recommends a full strip every 10,000 miles of road riding (16,000 km - twice as frequent as BMW's service schedule) and a dump-and-run every 3000 miles (5000 km) to limit the amount of metal accumulation.

A further point in relation to the dump-and-run technique is the accuracy you're aiming for with the filled oil level (for ESA, the spec is 75 mm and 80 mm for the LH and RH forks respectively). With a measuring jug being around an estimated 6-7 times the area of the fork tube (at the measuring point), any error in the measured replacement oil level in the jug will be amplified by this proportion in the filled oil level. That is, a 1 mm error in the jug will result in say 6-7 mm error in oil level setting within the fork. A measuring cylinder would be more accurate, although may require the use of a funnel to catch the old oil, and would be more difficult to clean out the old oil/debris (maybe rinse with kerosene/paraffin).

109252
 
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I recall having the same questions. If I had to do it all over again, I would go through removal of springs. This was my first time. The next one will be pump and dump and I may just alternate the full vs partial moving forward. I think the trouble wouldn’t be worth it each time but fwiw, that last percent or two had more crap than the rest of the oil. So, if it’s the first ever, maybe consider removing springs?


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Discussion Starter #104
It’s certainly a useful technique if you simply wish to change oil viscosity.
 
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