Join Date: Mar 2006
Location: West Milford, NJ, USA
Re: Fork oil
Witaj na forum, Romku.
To confirm that you can use either: the K1200LT factory manual says SHOWA ATF fluid (indeed: Automatic Transmission Fluid). However, the RepROM for the R series, says SAE-10 hydraulic fluid, BMW p/n 31 42 9 062 158.
Type of oil is not critical: there are no damping valves in the fork legs, and as donn said, it only serves to lubricate the sliding parts. All damping is done by the central shock.
Having said that: why are you asking? If you are replacing a seal, you may not need any extra oil: just hold the fork tube vertical in order not to spill it out. I removed the slider though the top and wound up without having to add any oil.
After removing the slider, measure the level of oil inside. If both forks are even you are good to go (unlikely that both lost the same). This is because even if you see oily surface on the slider, it is a very small amount leaking out.
A hint, again - if you are taking them apart - you may use a bit of oil on the top seal to let you stick the slider tube back in. That stays between the seal and the dust seal and makes the slider look leaky for a long time. I know...
Also, when reassembling, make sure that the fork legs are in original positions. I took off one at a time, to assure that the wheel will be straight after reassembly. On the GS, it still was not running straight; I loosened the fork clamps and forced the wheel against an obstacle to get it to run straight with handlebars straight.
Robert in Northern NJ
'09 R12GS, '08 R12RT, '03 R1150RT, '01 F650GS - time to thin the herd?
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Last edited by rdwalker; Nov 4th, 2009 at 8:20 am.