Join Date: Sep 2003
Location: Austin, TX, USA
There seems to have been a change in BMW's specifications for the transmission and rear drive fluid over time. My 2003 LT owners manual recommended 80-90 gear oil. It seems now that BMW recommends 75-140 gear oil for the later models. The dealer swithched mine to synthetic at the 12K service-not sure what viscosity or brand lube they used. I noticed that shifting was easier using the synthetic lube and have used it ever since.
Not sure where the info about the 'lifetime' rear drive lube came from in the post you cited, but my maintenance schedule has always called for changing the rear drive lube at 12K. I have made it a point to change mine at 6k when doing the oil change given the low cost and piece of mind I get from the more frequent changes. My LT now has 28K on it and the rear drive lube has looked almost new when I changed it the past 2 times.
BTW the LT doesn't have a wet clutch. Most other motorcycles use the motor oil to lube the clutch. There have been many discussions about oil requirements on the LT since it has a dry plate type clutch.
“Res ipsa loquitur, sed quid in infernos dicet?”
2003 K1200 LTC Titan Silver
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