Hi everyone, recently I had issue with transmission fluid and filter change.
Local euro shop replaced my filter and fluid - GM 6L45 transmission (Uses Dexron VI), 59,727mi, 2011 328i
They used Liquimoly Toptec 1800- which is Dexron VI approved (bottle saids that) . So technically, it should not make problems.
All of the reviews are really good, and some users told me this is really rare to see problems with this fluid. Multiple local euro shops uses this when I asked for a transmission fluid change quote.
Anyways, after fluid change my car was having bumpy shift issue randomly- sometimes smooth sometimes bumpy. Fluid level was correct.
After driving like this for around 300 mile, second shop (where I trust) drained almost 6.5 qts out from drain plug and filled with 6.5 qts of Valvoline Dexron VI fluid.
Didn't dropped the pan since filter was new, and no time to order new pan gasket and bolts.
I need to see longer results but as of now, bumpy shift is gone.
Basically, Original fluid was Dexron VI from factory. First fluid change, 6.5 QTS of TOPTEC 1800. Second fluid change was 6.5 QTS of Dexron VI.
Some people told me it is bad to mix fluid like this but I am unsure, since both D6 and Toptec1800 should be developed expecting to be mixed with original fluid since most of people do drain and fill rather than complete fluid change.
So here's my concern-
Since Toptec 1800 is Dexron VI compatible- will it be fine to mixed like this?
I checked both fluid specs and it seems pretty similar.
Local euro shop replaced my filter and fluid - GM 6L45 transmission (Uses Dexron VI), 59,727mi, 2011 328i
They used Liquimoly Toptec 1800- which is Dexron VI approved (bottle saids that) . So technically, it should not make problems.
All of the reviews are really good, and some users told me this is really rare to see problems with this fluid. Multiple local euro shops uses this when I asked for a transmission fluid change quote.
Anyways, after fluid change my car was having bumpy shift issue randomly- sometimes smooth sometimes bumpy. Fluid level was correct.
After driving like this for around 300 mile, second shop (where I trust) drained almost 6.5 qts out from drain plug and filled with 6.5 qts of Valvoline Dexron VI fluid.
Didn't dropped the pan since filter was new, and no time to order new pan gasket and bolts.
I need to see longer results but as of now, bumpy shift is gone.
Basically, Original fluid was Dexron VI from factory. First fluid change, 6.5 QTS of TOPTEC 1800. Second fluid change was 6.5 QTS of Dexron VI.
Some people told me it is bad to mix fluid like this but I am unsure, since both D6 and Toptec1800 should be developed expecting to be mixed with original fluid since most of people do drain and fill rather than complete fluid change.
So here's my concern-
Since Toptec 1800 is Dexron VI compatible- will it be fine to mixed like this?
I checked both fluid specs and it seems pretty similar.
- Should I do complete fluid replacement by pumping 13 qts of fresh Dexron VI
- Or,
- Since Toptec 1800 is compatible fluid for Dexron VI, am I okay to drive a while and do drain and refill in 5000~10000 mi?
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