Tranny fluid

The Velvet Monkey · Post by **The Velvet Monkey** » Mon Mar 27, 2006 3:00 pm

Anyone else running 75/140 in their transmissions?

If so, how's it going?

Lion_Lady · Post by **Lion_Lady** » Mon Mar 27, 2006 3:23 pm

Just switched to Amsoil 75/140 for my 12K. I've only gotten in 200 miles on it so far.

Not noticing anything obviously different... but maybe that just means I'm no longer noticing the shifting? Seems like less "clunk."

P

The Velvet Monkey · Post by **The Velvet Monkey** » Mon Mar 27, 2006 4:11 pm

Amsoil is exactly what I plan to use (great product). I like less clunkiness!

jamais · Post by **jamais** » Mon Mar 27, 2006 5:45 pm

I first used Mobil 1 brand which I believe is 75-90W. Shifting was still a bit stiff in cold weather. Switching to BMW's synthetic 75-140W and cold shifting was smooth. The difference between the two weights is really amazing.

I still use Mobil 1 75-90W in the rear drive.

mnnden · Post by **mnnden** » Mon Mar 27, 2006 8:00 pm

I switched to Amzoil 75/140, I noticed a difference right away.( Although I never had any problems with the gearbox or shifting,) I could feel the difference, I think I am going to switch to the Amzoil for the engine also.
Den

gel9001 · Post by **gel9001** » Mon Mar 27, 2006 8:14 pm

As per dealer recomendation, I've been running 75/90 since the beginning both in tranny and final drive.

Lion_Lady · Post by **Lion_Lady** » Tue Mar 28, 2006 12:45 pm

gel9001 wrote:As per dealer recomendation, I've been running 75/90 since the beginning both in tranny and final drive.

When I stopped in my dealer/shop to pick up the 12k service "bits," I talked to one of the counter guys. (He'd been a service tech in the same shop for at least 5 years, and had JUST made BMW "Master Technician" then decided that he needed regular, 12 months a year income, to buy a house.) At any rate, HE gave me the grade/weight of synthetic oil to get for the drive/tranny. I figure if anyone has a clue which is best, he would.

P

Post by **challey** » Tue Mar 28, 2006 9:48 pm

Just curious, what would be the downside of using 75/140 vs 70/90 gear lube - other than of course voiding the priceless BMW warranty? It seems like the difference is trivial on the cold value and I wouldn't think that 140 weight could have anything but a beneficial effect when everything was fully warmed up.

Capt. Blackadder · Post by **Capt. Blackadder** » Tue Mar 28, 2006 11:24 pm

BMW synthetic 75/140 here. Have also tried Motul 75/90 and Amsoil 75/140. All were big improvements on the original oil.

Paul Mihalka · Post by **Paul Mihalka** » Wed Mar 29, 2006 9:12 am

challey wrote:Just curious, what would be the downside of using 75/140 vs 70/90 gear lube - other than of course voiding the priceless BMW warranty? It seems like the difference is trivial on the cold value and I wouldn't think that 140 weight could have anything but a beneficial effect when everything was fully warmed up.

No way using 75/140 gear oil would void the warranty. BMW has it's own highly recommended 75/140 synthetic gear oil.

Post by **gagator79** » Wed Mar 29, 2006 9:38 am

Have been using the 75/140 (Mobile 1 syn) for about 3K miles...no apparent problems and as above...seems a little less 'clunky'.