How To Service A BMW Automatic Transmission: Step-By-Step

Servicing an automatic transmission can feel like a daunting task... At least thats what it felt like for me when I first started wrenching. Its actually quite simple.. and in this video I will be showing you my process step by step. Ive serviced probably 100 automatic transmissions up to this point and this the process I was taught by my shop foremen and mentors and its worked great for me up to this day. I havent had any transmission issues that I can recall, besides already present transmission symptoms that were exacerbated by changing out the fluid. I wouldnt recommend servicing your transmission if its slipping or banging gears, I would only do it with an additive as a last resort hail mary before buying a rebuilt replacement. I use this process on every automatic transmission I come across, whether its a BMW, a Chevy, or Toyota. The fluid type changes, based on transmission manufacturer, as well as the pan, filter, hardware, gasket, sleeve, and possibly final fill procedure, but its just the "same" parts on a different car shaped a little different. Ill go over removing the fill plug, draining the automatic transmission, removal of the transmission pan, gasket, and filter, cleaning of the gasket mating surface, replacement of the mechatronic sleeve that seals the wiring harness as it enters the transmission (also causes oil leaks), initial fill, and final fill procedure on this 6hp21 ZF transmission. This car is my 2008 BMW "E90" 335i with the N54 engine. I just finished a engine replacement series here on youtube and I will link it below! I hope you find this video helpful! Im not a transmission expert, and it might not be the perfect procedure, but this is how I was shown to do it, and its worked pretty dang well for me this far. I will link tools and parts used below. Enjoy! BMW "E90" Engine Replacement Series! WATCH PART 1:    • I Dropped The ENTIRE DRIVETRAIN Out Of My ...   WATCH PART 2:    • What It Takes To Replace A BMW Engine   WATCH PART 3:    • What Building A "New" BMW Engine Looks Like   WATCH PART 4:    • What Prepping A BMW Engine For Install Loo...   WATCH PART 5:    • Installing The Entire Drivetrain Back Into...   BMW E46 GIVEAWAY SERIES PLAYLIST!!!    • Fix & Give Series - 2002 BMW 325CI   If youd like to support the channel, consider becoming a member!    / @dayoffdiy   Or if Patreon is more your speed, we have one of those too!   / dayoffdiy   Venmo Donations https://account.venmo.com/u/dayoffdiy Cash App Donations https://cash.app/$DayOffDIY DAY OFF DIY Discord Link!   / discord   TOOLS USED: 8MM Allen Socket https://amzn.to/3SmrUKA 10MM Allen Socket https://amzn.to/4eHPngK Torx Sockets https://amzn.to/4xM4y14 1/4" Torque Wrench https://amzn.to/3SZAQ8L Transmission Fluid Pump https://amzn.to/3QZNcgD PARTS USED: https://www.fcpeuro.com/products/bmw-... https://www.fcpeuro.com/products/bmw-... 19