Originally Posted by Bitsobrits
Taffmog,

I believe all the M3W have a 6 liter oil tank capacity. My 2012 certainly did until I replaced it with a thicker walled 7 liter unit I had fabricated. 2 liters is quite small, and half the size specified by S&S for this engine in their literature. If your tank was in fact a measured 2 liters, then it had to have been a retrofit. Photos?
No.3 was a very early car. Did it have the same small oil tank as the Geneva car? [Linked Image]

Andy