final drive survey

[RTophile]

Hi everyone,

I am experimenting with molybdenum disulfide in several vehicles and applications.

It would be a help to me if BMW riders who do their own service work could provide input on this question:

When you change your rear drive gear oil, are there metal shavings and (black) particulate stuck on the magnet each time?

My old '83 R100RT always had a few shavings and some black particulate stuck to the magnet, I saw that as the norm over the years.

My new R1150RT had some shavings and particulate at first, but after break in, I began running (2 ounces per qt ratio) molybdenum disulfide in my gear oil and after 4,500 miles, my magnetic plug was clean, which surprised me.

I'd like to know if a clean magnetic plug is normal on the new BMWs.

Thanks in advance for your input.

Greg

[username]

well, i cant answer your original question, but i have one for you. where did the molybdenum disulfide idea come from? is there some background on it? whats the theory on why it might reduce the presence of shavings on the plug? (demagnetizes the plug? :D )

[RTophile]

I was enrolled in the American Motorcycle Institute in 1991. We dyno tested a Canadian GSXR750G in two back to back runs. After we added 4 oz of moly, it gained 2.5 HP. The reason for that was friction reduction.

Molybdenum disulfide adheres to ferrous metals, favoring adhesion to porous areas like cylinder walls (crosshatching). The flat particles have a super-slippery outer surface. The best and most desirable function moly provides is that it is present and actively lubricating the instant startup occurs, prior to oil pressurization and flow. Estimates on engine wear at startup run between 80% and 90%.

Moly is used as (or in) assembly lube by almost all manufacturers. Honda adds it to their HP4 motor oil and recommends that oil for wet clutch use, however, moly manufacturer Ben Mathes of Guard Dog Moly Inc. does not recommend wet clutch, limited slip differential, or locking differential applications for moly.

Moly is now becoming the "dry lubricant revolution" leader. You can search the term on Google and find loads of interesting articles and creative applications.

http://www.guarddogmoly.com/

This is where I get my moly. I have spoken to Ben Mathes, company co-founder several times. I have thoroughly checked every thing he's ever claimed moly does, and found independent verification in every case.

Because BMWs have a dry clutch and separate oil reservoirs, they are the perfect bike to use moly in.

If you have questions about moly, ask away and I'll try to answer.