Good gearbox oil? - - Excellence in Motion
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post #1 of 4 (permalink) Old Jul 2nd, 2007, 12:00 pm Thread Starter
Join Date: Apr 2007
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Good gearbox oil?

Uh oh... an oil thread. :o

Can anyone recommend a good gearbox oil for my '87 K100? I drained it about 400 miles ago and it obviously had moisture in it (been covered in another thread). I drained it out and replaced with El Cheapo 80-90W oil with the expectation of replacing that within the next 200 miles and seeing if the water has been minimized. I bought Red Line Heavy Shockproof which is rated at 75-250W but I've seen some things written that the Heavy is too thick for the box, but good for the rear drive. The shifting has been notchy, so I'm guessing a good moly additive is recommended. Anybody want to chime in and say what they've had success with? Thanks.
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post #2 of 4 (permalink) Old Jul 2nd, 2007, 12:06 pm
Join Date: Jul 2004
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I would say to flush it a couple more times with El Cheapo then use Mobil 1 75W/90!

Bruce C
'04 K1200RS Capri Blue(totaled)
2008 Triumph Sprint ST
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post #3 of 4 (permalink) Old Aug 10th, 2007, 10:18 am
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Amsoil 80w-90 is great. Full synthetic.

Lache pas la patate

Robert Odendahl
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post #4 of 4 (permalink) Old Aug 10th, 2007, 4:39 pm
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Location: Sillycon Valley, CA, USA
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Originally Posted by brucecha
... then use Mobil 1 75W/90!
Drained the gbox at 24K and decided to give Mobil 1 75W/90 a try. For reasons unknown to me, the thing seems to shift a lot smoother now.

Black 2002 K1200RS - "The Beast" (over 100k miles)
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