Risk of mixing
05-10-2017 | 07:11 PM
#1
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Joined: Apr 2017
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From: pa
My Ride: 528i
Model Year: 2010 528i e60
Engine: N52k
Risk of mixing
I have a 2010 528i and supposedly BMW poured LifeGuard 6 in the ZF transmission at the factory.
That was 50,000 miles ago and it might be prudent to drain 5 liters out of the transmission pan and pump 5 new liters of LifeGuard 6 into the transmission.
What are the risks (if any) of mixing the old LifeGuard 6 fluid with the new LifeGuard 6 fluid?
That was 50,000 miles ago and it might be prudent to drain 5 liters out of the transmission pan and pump 5 new liters of LifeGuard 6 into the transmission.
What are the risks (if any) of mixing the old LifeGuard 6 fluid with the new LifeGuard 6 fluid?
05-11-2017 | 07:49 AM
#2
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Joined: Oct 2009
Posts: 1,380
Likes: 3
From: Indiana, USA
My Ride: 2007 530xi: Sport, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, HD Radio, SAT, Custom NCS coded options 2008 535xi: Sport, Night Vision, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, SAT, Custom NCS coded options, Rear Seat Heat Retrofit, Passport 9500ci
Model Year: 2008
Engine: N54
No risk at all and is recommended.
However, you should also replace the plastic pan/filter.
Be sure you know the proper fill procedure. You can't just pump 5 liters back in. The temperature and technique need to be precise.
However, you should also replace the plastic pan/filter.
Be sure you know the proper fill procedure. You can't just pump 5 liters back in. The temperature and technique need to be precise.
05-11-2017 | 09:15 AM
#3
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New Members
Joined: Apr 2017
Posts: 426
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From: pa
My Ride: 528i
Model Year: 2010 528i e60
Engine: N52k
You say the temperature and the technique needs to be precise.
How about if I take out the margin of error?
That is, I unscrew the drain plug when the transmission is cold? That way I measure the exact amount coming out and only pump the same exact amount back in?
Is there a flaw in that methodology?
How about if I take out the margin of error?
That is, I unscrew the drain plug when the transmission is cold? That way I measure the exact amount coming out and only pump the same exact amount back in?
Is there a flaw in that methodology?
05-11-2017 | 10:23 AM
#4
Senior Members
Joined: Oct 2009
Posts: 1,380
Likes: 3
From: Indiana, USA
My Ride: 2007 530xi: Sport, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, HD Radio, SAT, Custom NCS coded options 2008 535xi: Sport, Night Vision, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, SAT, Custom NCS coded options, Rear Seat Heat Retrofit, Passport 9500ci
Model Year: 2008
Engine: N54
You say the temperature and the technique needs to be precise.
How about if I take out the margin of error?
That is, I unscrew the drain plug when the transmission is cold? That way I measure the exact amount coming out and only pump the same exact amount back in?
Is there a flaw in that methodology?
How about if I take out the margin of error?
That is, I unscrew the drain plug when the transmission is cold? That way I measure the exact amount coming out and only pump the same exact amount back in?
Is there a flaw in that methodology?
besides... as I said. What if it is under-filled now? You really want to do all this only to still have an under-filled trans?
05-11-2017 | 11:23 AM
#5
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Joined: Sep 2016
Posts: 166
Likes: 1
From: New York
My Ride: E60 550i
Model Year: 08
Re
Only if you use other type of oil would be considered as mixing, no worries as long as you continue using the same.
Do not open the fill screw when engine is not running or you will loose oil and create complications.
If you're not familiar with this process and you want to do DIY, read and familiarize with proper procedures including timing and temperature.
Do not open the fill screw when engine is not running or you will loose oil and create complications.
If you're not familiar with this process and you want to do DIY, read and familiarize with proper procedures including timing and temperature.