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#31
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The can of wurms....
At 125k drained the AT again when the engine had to come out for all new seals as it was leaking too much oil from various places. The fluid from the AT was pretty black again and somewhat thinner than it went in. I was glad to have a chance to refill it with fresh Lifeguard fluid. On my 2009 E70, which has the ZF 6-speed with the mechatronic, I replaced the fluid and pan/filter somewhere between 80 and 90k. Last year I made some very long drives with it (the odometer increased from 132k to 150k) and found the shift quality deteriorating. Just recently drained and filled it again and also replaced the pan. Used Lifeguard 6 for this one. After a reset of the adaptations it is shifting beautifully again. I would consider the next service to be due in 50k miles. I also drained and flushed my 2005 Toyota Tundra AT again as it exceeded 200k. Did so the first time at 100k and the fluid seemed almost new. This time the liquid showed a bit more discoloration than the first time but not shockingly so. As an additional precaution I did a second drain/fill about a 100 miles later. The truck never had any issues with shift quality. It was never used for towing and mostly did light duty and a lot of long distance highway miles. It did do service as a commuter vehicle for a few years. I am not a lubricants engineer but personally I believe that these fluids do deteriorate with time and above all with use and temperature cycles. (I was appalled at the condition of the fluid in the transfer case of my Cayenne at 56k.) So, even if I were to acquire a vehicle with high mileage, I would still drain/fill and replace the filter. The reduced ability of the additives to provide complete lubrication/protection, I believe, will do an AT no favors. I find it hard to believe that solids accumulate and then get dislodged in a mechanical unit where fluids are pumped around at substantial pressure. I am surprised this is a discussion. No one hesitates to refresh their diffs or the TC. Note that these are only my opinions based on what I have seen from my vehicles (and had some intimate moments with the innards of my 5HP24 ), not a recommendation or call to action. YMMV.
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2003 4.4i black ext./black int./black headliner (kid's runabout) 2014 535d X-drive, M package, silver/black interior Sold but not forgotten: 2009 E70 35d, black ext./black int./black headliner (sold 2021) 2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly... Other hardware: 2015 Cayenne S (wife's new DD and definitely wroooommmmm) 2016 Tundra 1794 edition crew cab, luxo hauler 2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles. |
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#32
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#33
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If you really want the old fluid out, drive it for a week or so and drain and fill again. I did three cycles on mine all a week apart to get as much of the old fluid out as I could .
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#34
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Quote:
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I used Valvoline MaxLife in the E53 GM L-480E and ZF Lifegaurd 5 in my E46 ZF 5HP19 with Genuine BMW filters and gaskets for each and over 5,000 miles later in both cars, no issues at all. Just happy driving!
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Digital Competition Systems The older I get... The faster I was... No Fear |
#35
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I'll add a data point. 190,000 mile ZF 6hp19 in our E61 got fluid changed along with the 3 tube seals, bridge seal, mech sleeve, and filter/pan. Went with Liqui Moly Top Tec 1800 on that gear box. Everything has been great since.
Now, the wife's 167,000 mile E70 X5 w/ 6hp28x is another story. I'm looking for a replacement gear box currently for that one. It has a bad e clutch bearing and won't handle the pressure shifting into 4th or higher (e clutch engagement necessary). Tried to hail mary that one with a valve body rebuild, tube seals, mech sleeve, and 3 different fluids. Pentosin, Redline, and Valvoline. The Valvoline actually allowed the trans to grab 4th, but not every time and definitely not very smoothly. Red has 124,000 miles on it and will be getting the same treatment the E70 did (VB rebuild, seals, etc) this year. Will likely throw the Valvoline or Liqui Moly in that trans when the time comes. LoL, anyone want to buy the 7qts of Lifeguard 6 I have sitting on the shelf.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#36
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I own a transmission/driveline shop. We shy away from servicing transmissions over 125k miles, if it hasn't been serviced before, especially since most people who are looking to service them are experiencing a problem and are hoping for a cheap fix.
We recommend servicing auto transmissions every 30k miles, manuals, transfer cases and diffs every 50k miles. |
#37
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I changed my gearbox oil and filter also changed the mechatronic sleeves and bridge seal.if wasn't too bad to do but you must have patience and a torque wrench.
These are the parts I used mine is a 6 speed zf gearbox 3.0d https://youtu.be/C9C24K-a3cE |
#38
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I have 190000 miles and as far as I know it has never been serviced. I have started experiencing sporadic hard shifting from 1 -> 2 but other than that, it's all good.
Not sure if I should service it or not... |
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