The part number is 33117525064 and it's about 3 bucks. It takes a 14mm hex bit, and if you're doing things by the book you should use a new plug when you refit it. The diff only has a fill plug, no drain plug which makes this part a royal pain. 135i may be similar, I don't know for sure. Having it level is important for complete draining of the old fluid and filling an accurate quantity of the new fluid. Now the car should be off the ground and supported by all four jacking points. Make sure the jack/jackstand is securely located in the jacking point Plywood 'pucks' which fit the jack and the car's jacking blocks without damaging either. My jackstands won't clear the car when it's on the ground, so I have to use a floor jack to get it on blocks of wood. My jacking procedure is a bit convoluted, because it's left over from my old BMW which had no real central jacking points.Ĭhocked the rear wheels, car's out of gear, and handbrake is on. I let it cool down a little so the chances of getting burned are lower.įirst, the car needs to be raised up and level. This works best when the car has recently been driven so the fluids are warmer, thinner, and will drain more easily. New diff filler plug (optional) BMW P/N: 33117525064 Low profile 8mm hex bit, or 8mm hex drain plug bitįluid pumps compatible with fluid bottlesįlexible tubing, just over 1/4" inside diameter ~2 quarts diff fluid (I used redline 75w90) ~Gallon transmission fluid (I used redline d4 ATF) A gallon is a bit more than you need but is less messy than swapping pumps to multiple bottles. Good to see the filter is doing its job but I still wouldn't feel good about letting that go 15k miles. Much of the white specks on the ridges and sides are camera flash reflection, though you can clearly see the amount of metal in the valleys of the filter.Ĭlose-up of single oil filter pleat, after 1200 miles Not relevant to this DIY, but interesting:įactory fitted engine oil filter, after 1200 miles The amount of particles in the fluid that came out convinced me that this was worth the effort:įactory fill transmission fluid after 1200 miles.įactory fill differential fluid after 1200 miles. Apparently BMW used to do a 'break in' service on all cars, which went away with free maintenance and lifetime fluids. I did this service plus an engine oil and filter change on my car at 1200 miles. Likewise, other model year 128i cars may even have small differences, I don't know. My car is a 128i the 135i procedure is probably similar but with some differences to capacities, bolt sizes, and torque specs. PLEASE DO YOUR OWN RESEARCH AND SELECT YOUR OWN CHOICE OF FLUIDS The fluids used were my personal preference, and may not be officially approved or recommended for use in the car. I'm not responsible for any damage, warranty denial issues, etc. Disclaimer: use any of this at your own risk.
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