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#1
11-30-2011, 08:47 PM
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I hope I didn't squelch anyone's opinion... when I get on my soap box you can't shut me up... this has not served me well at times
 I talked to my friend who owns the Trans shops about the bmw long life/ lifetime trans fluid deal. If a BMW comes to him and the car's trans is functioning the way it should regardless of the miles he will do the fluid change. If it's newer under 50,000 miles he does the power flush. if it's a higher than 50,000 then he does the pan drop, drain and fill 3 times. On the next change they do the power flush in both scenarios. he does the filters at the same time. In transmissions that he has fluid changed, remember no apparent defects in the trans he has never had a failure related to the fluid change. He said he does not believe that any machine that reaches the high temps of a transmission doesn't need it's fluid changed. He also said that in transmissions that he maintains for people it's nothing to get 200K+ out of a transmission. He basically doesn't buy it, and he said all transmissions should be maintained with change intervals. This doesn't settle anything but, an expert has weighed in. 
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#2
11-30-2011, 10:06 PM
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Ghost-Flame:
The following will explain the background on adaptive transmission shifts. These are BMW training materials that cover this. Essentially, when automatic transmissions became electronic, manufacturers gained control over shifting, and then in a further development, gained the ability to measure shift performance, and adapt clutch pressures based on shift times. They measure slip (difference between input and output speeds) and adjust for clutch wear, among other things. That is what gets invalidated when the fluid is changed, as the transmission has stored the expected shift characteristics. Your transmission shop will know the importance of clearing those adaptations with a computer diagnostic tool when they change fluids on a BMW (and the same applies to many other makes of vehicle). The following are BMW materials, so they apply to both the GM and ZF transmissions. They are worth reading through, IMO. Transmission Fundamentals Part 1 Transmission Fundamentals Parts 2 Electronic Transmission Control Part 1 Electronic Transmission Control Part 2
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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#3
12-01-2011, 12:56 AM
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huh, i always thought i was doing the right thing by changing into neutral when stationary in stop start driving, however after reading through the above links it seems that if one is in stop start driving the trans adapts and stays in second gear, unless speed goes over 40 mph or the trans is shifter to sport or NEUTRAL.
i always thought i was doing the right thing by easing the load on the torque converter and that in tern would keep heat down. i going to have to re-evaluate this in light of the above
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#4
12-01-2011, 01:14 AM
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At idle there is no significant load on the torque converter, so changing it into neutral won't make a difference, apart from wearing out the linkage earlier. If you are stopped for more than 15 seconds, it makes more sense to turn the engine off, as that will reduce wear and save fuel (assuming you are in a location where that is safe to do so).
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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#5
12-01-2011, 04:57 PM
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I just called ZF USA in IL. and spoke with a technician there regarding this very issue. Just a note: I actually called them prior to reading this thread as I was contemplating doing a tranny fluid change and wanted to get the manufacturers recommendation first.
His recommendation regarding this topic (at my 75k mileage) was "the transmission should be serviced". I asked him about BMW's Lifetime fluid statement and he said it's more about BMW's "Maintenence Free" marketing than anything else. He said if the fluid is not discolored and does not smell burnt or has excessive sediment then there is no harm in a drain/filter/and re-fill. He did recommend staying with Esso(Mobil) 71141 or ZF Lifeguard #5 He said if the fluid is dark and smells, then there are other issues with the transmission going on. Just thought I'd pass this on....
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03' X5 4.4i Black Sapphire/Black 04' Land Rover Range Rover HSE 95' Jeep GC Ltd Last edited by bsprtsgrp; 12-01-2011 at 05:17 PM.
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#6
12-01-2011, 05:41 PM
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Quote:
From this experience, I believe if you want to flush the fluid do it early w/ filter and forget the second time around altogether (it's diminishing return IMHO). I am planning doing it on my 535i 6-sp ZF trans next month @35K on the odometer and maybe never have to do it again until I sell the car. TRemember there is a California store that carries ZF-5 and ZF-6 fluid so no guessing game no more(The CTSC - ZF Parts), if you want to do it do it right.
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#7
12-02-2011, 10:39 AM
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Quote:
What of the heat related properties of fresh trans fluid vs old trans fluid? I was always told that fresh atf helps keep the trans cooler; that may not be a benefit in these transmissions. you and a lot of others are apparently having great success leaving the trans fluid in, that's worth considering and it's interesting and it flies in the face of my logic. I'm exhausted, I'm done  Now can you and JCL check my thread on removing the trans and tell me what you know? I promise I won't argue 
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