Z3 / Z4 /ZMBMW Z3 Forum & BMW Z4 Forum - Covers all the past and present Z3/Z4 vehicles including: BMW Z4 Coupe 3.0si, BMW Z4 Roadster 3.0i, Z4 Roadster 3.0si, and the ZM Coupe and Roadster (BMW Z4 Forum, BMW Z3 Forum, BMW ZM Forum)
So, BMW apparantly don't know how to service their vehicles. I went to BMW and tried to find out what type of oil the transmission takes. I also asked (and got) differential oil. They couldn't find out the part number for the transmission oil. I had a discussion with the service rep and tried to convince him that the transmission oil is NOT a lifetime fill. I can understand why he thought that, but he was wrong. The non-M cars do not have a lifetime fill. Its states in the "Supplementary M" owners manual that the transmission fluid is replaced at service inspection 2. Granted, I was trying to do it earlier than required, but I wanted to do some preventative maintenance.
After I changed the trans oil, the shifter felt so much smoother, and I am not exaggerating. I suggest that all M owners replace the trans oil, you will feel the difference.
You are correct, I have been to ZF in germany,where they make the BM gear boxes, if you find the part number on your box it will start with ZF, anyway I had to go there to get my box serviced as BM wouldnt do it, whilst there I asked the question ' life time or not ?' answer: NO, service at 80,000 then every 40,000 miles and he said this includes 'M' variants.
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