Article by: Paul Axford Applies to: All models with the M30 big six engine (this article was written with a 730i). The 730 and 735 big six automatics all have the ZF 4HP22 4-speed transmission, which is installed on hundreds of thousands of various European cars. Additional models with the […]

Article by: Binjammin Applies to: Most BMW models with a limited slip differential. So I had this extra rear laying around, I decided to check out the condition of it and clean it up. Turns out it’s in nice shape, could maybe use new clutches but I’ll see if I […]

Article by: Sean Article applies to: all BMW models. Problem: Lots of them. What else did you think? It started with vibrations from 0-60 km/h (0-40 mph) under mild or hard acceleration, highway speeds no problem. Later it became a knocking, thumping and clunking sound from underneath the car (located […]

Article by: Johan Article applies to: all models with the ZF4HP22 automatic transmission. Problem: The ZF4HP22 gearbox in my car has shifted a bit rough from 3rd to 4th for a while now. But a fluid change, the first time with a new filter, every now and then had prolonged […]

Article by: Johan Problem: Every time I went for a long drive I noticed a burned ATF smell when getting out of the car. I also had to fill the gearbox every 1500 km to keep it shifting smoothly. The underside of my car was completely covered with ATF. When […]