The premium mineral-based gear lubricant BMW Hypoid Gear Oil (SAE 80W90 GL-5) is designed for motorcycle transmissions, rear axles, and final drives.
BMW Gear Oil: Re:
Choices:
(For K-Model gearboxes and rear drives, as well as for Boxer gearbox, shaft, and rear drive assemblies)
The Synthetic 75W-140 will perform admirably in your K75S; I now use it. As the transmission heats up, shifting tends to become smoother (or actually – maintain smooth shifting.) I also don’t know why the synthetic has no GL5 mark.
BMW doesn’t make its own gear oil. Going to a budget auto store and paying a third less for a comparable product would be beneficial for your wallet. It won’t matter to your bike.
I’ve been using “Mobil 1” in the rear and trannies for more than ten years, and I think it makes fantastic gear oil.
My most recent two new cars’ warranties expired last year. I made the decision to use the same lubrication in each of my vehicles in an effort to streamline my life.
Fortunately, all of them have similar lubricant specifications. I use Swepco 201 gear oil and Mobil 1 Super Syn 15w-50. For Porsche transaxles, Swepco is regarded as the best, and it works well for me. The 911 requires around.8 gallons (the only way to get it), while the K and R each require around.2 gallons, even though it’s probably more expensive than even BMW lubricant. As a result, I swap out the 911 and the bikes once a year, which is probably twice as often as I should. In my opinion, bike lubrication is provided for free.
I’m a novice, yes. Before I switch to syn, I simply have one more query: I have a 2003 K-1200LT with 10,000 miles; can I truly put syn in my transmission as well? I’m convinced on the final drive. matthew
The 75w140’s BMW price is competitive with items from bargain stores. I believe both cost $15 a quart, with the BMW-branded quart being a little less expensive.
Whether I put the lighter material (such as 80w90) or the heavier material in the tranny, my GS doesn’t seem to mind. On the other hand, the thicker material definitely made my old K75s shift more smoothly.
For the record, ALL BMWs have a dry automotive style clutch (although, to be completely honest, I can’t vouch for the F650 as it isn’t a BMW like other Aprilias or Rotaxes are). The new K12S will have a wet clutch once it is available.
Water Found in a BMW Airhead Motorcycle’s Gearbox
For a post-purchase examination, the Airhead BMW motorcycle is in the shop. There was a lot of water found in the gear oil, which was caused by condensation from sitting or brief travels. Annual gear oil changes Short journeys won’t cut it; when you ride, get the bike hot enough to burn off any moisture that may be present in the gear oil. Regardless of what the seller claims about the bike’s service history, you should change all the fluids when you purchase a used bike. Water emerges first because it is heavier than oil. The gear oil will blend and appear like chocolate milk if you have been riding the bike with water in the gear oil.