fd oil

[autogs]

75/90 syntrax all the way

 

[Delboy777]

Why are some people saying they are using 75W-140 oil rather than 75w-90?
Is it better?
Is 75w-140 now the recommended grade for gearboxes and FD's?

Personal choice I suppose, but as there is very little in the way of a price difference and 75w-140 is better AFAIC, that's what I will use.Its your own choice.

 

[JimVonBaden]

BMW reduced the FD oil level because they were getting warranty claims for oil leaks that were actually breather blow-by.
But the original design called for 200ml and most drives behave fine with 220ml.
Running with a low oil level risks accelerated bearing wear in the long term but it won't cause many short term oil "leak" warranty problems.
Simple fix use less oil.
Running a high oil level risks the breather blowing out some oil but it's frankly not a big issue. Mine has 220ml and leaked only when I forgot to fit the speedo sensor O ring.
Mikey repairs a lot of worn final drives so should be well placed to spot those caused by under lubrication.

The original design was 240 new, with 220 after.

It was later changed to this:

Camhead DVD\Factory Manual\Datas\RepRom\BMW-Motorrad\SYMB\KG\MODELLE\00\techdat.gif Technical data
Rear-wheel drive, oil capacity
Initial filling
200 ml


Fluids and lubricants

Castrol SAF-XO

Refills:
Camhead DVD\Factory Manual\Datas\RepRom\BMW-Motorrad\SYMB\KG\MODELLE\00\techdat.gif Technical data
Rear-wheel drive, oil capacity
Oil change
180 ml


Fluids and lubricants

Castrol SAF-XO

 

[Bendy toy]

That explains why mine, "overfilled" at 220ml, has not blown any oil out of the breather.