I've now driven my M3W 1250 miles and 250 of them with Moroso Climbing gear lube in the BB. ( I've previously driven 27,000 miles over 10 years with the same lube in a Jag IRS rear end, so I have confidence in the product)
When I opened up the 15/16" drain port at 1001 miles and nothing what so ever came out. I left it open over night, and a few thimbles full of thick moly grease came out. I capped it, topped off the BB with fresh climbing lube, and drove 100 miles. It accepted almost the full 2 pints!
I came back with the BB still hot, and drained out the warm moly grease / climbing lube mixture, let it drain over night, and re filled with fresh Moroso climbing gear lube.
Just came back from 150 mile journey. The total BB whine is about 85% reduced! and at times almost non existent. ( around town low speed)
It used to be nearly deafening, as the whine was at a frequency that was very annoying.
Someone made the comment that the org factory lube should be used for break in / seating of the gears......I agree, just make sure you have lube in there.
To me, it makes sense that a gear lube needs more than splashing around, it needs traction / binding on the gear that is greater then centrifugal force of the gear spinning.
There are numerous brands of this type gear lube, this is simply the one I've used for 12 years on a few cars.
Be sure you have lube in your BB, and at 1000 miles or so, flush out what's in there once or twice, and try a climbing lube.
Not perfect, but 85% better.
The M3W is a joy to own and drive, highly recommended.
