Transmission Fluid Change Dilema

cookie · 11-06-2009, 02:47 PM

I bow to Mr. Semper Fi. I went to the dealer to buy the oil for my 08RT Transmission the other day and was asked "synthetic or regular". Being the anal being I am I said synthetic. I went to Mr. Semper Fi's DIY and the picture shows full synthetic 75W90 oil to be used. Whoa there, I bought full synthetic 75W140.
Yep I called the dealer and they said there bulletin says to use 75W140 for transmissions. They also said the 75W90 was only for the final drive. I am not trying to cuase any confusion beyond my own. I am pretty confident in my man Semper Fi, he knows his stuff here. I also trust the dealer in Chico, CA "Ozzies".
What is a do it yourselfer to do here??

Semper_Fi · 11-06-2009, 04:08 PM

You are quite right, I am in the process of updating the Tranny DIY to be 75W140

Cheers

Semper_Fi · 11-06-2009, 04:54 PM

Jeff - please check the DIY now

Tranny DIY with 75W140

kthutchinson · 11-06-2009, 06:44 PM

Any idea why BMW is now requiring heavier oil in the hexhead transmissions?

Polarbear · 11-06-2009, 07:51 PM

FD and Tranny here, I use the same 75-140. The two oils are NO different 75-90 vs 75-140w! The latter can handle MORE heat stress, thats all

and thicken as needed, when things get really hot. Your FD/Tranny should never get there. Randy

kthutchinson · 11-07-2009, 05:23 AM

I asked why the change because I'm apparently 2 changes behind. My hexhead RepROM, 5th edition, dated 02/2007, says use SAE 90 GL 5 hypoid gear oil. So I missed the change to 75W-90 AND the subsequent change to 75W-140.

11-06-2009, 02:47 PM	#1
cookie Jeff Join Date: Jun 2008 Location: Paradise, CA Posts: 84	Transmission Fluid Change Dilema I bow to Mr. Semper Fi. I went to the dealer to buy the oil for my 08RT Transmission the other day and was asked "synthetic or regular". Being the anal being I am I said synthetic. I went to Mr. Semper Fi's DIY and the picture shows full synthetic 75W90 oil to be used. Whoa there, I bought full synthetic 75W140. Yep I called the dealer and they said there bulletin says to use 75W140 for transmissions. They also said the 75W90 was only for the final drive. I am not trying to cuase any confusion beyond my own. I am pretty confident in my man Semper Fi, he knows his stuff here. I also trust the dealer in Chico, CA "Ozzies". What is a do it yourselfer to do here?? __________________ Jeff Anderson Currently own an 2008 R1200RT. Have owned many big Jap bikes this is my first German Machine. Paradise, CA

11-06-2009, 04:08 PM	#2
Semper_Fi Runs with Scissors Join Date: Aug 2008 Location: Gloucester MA Posts: 1,974	You are quite right, I am in the process of updating the Tranny DIY to be 75W140 Cheers __________________ 2009 KGT1300 Red Apple Metallic (mine), 2005 R1200ST Piedmont Red/Light Magnesium (hers) Luis Roth BMWMOA #143775 BMWMOA Moderator

11-06-2009, 04:54 PM	#3
Semper_Fi Runs with Scissors Join Date: Aug 2008 Location: Gloucester MA Posts: 1,974	Jeff - please check the DIY now Tranny DIY with 75W140 __________________ 2009 KGT1300 Red Apple Metallic (mine), 2005 R1200ST Piedmont Red/Light Magnesium (hers) Luis Roth BMWMOA #143775 BMWMOA Moderator

11-06-2009, 06:44 PM	#4
kthutchinson Registered User Join Date: May 2007 Posts: 42	Any idea why BMW is now requiring heavier oil in the hexhead transmissions? __________________ Karl 2007 R1200ST

11-06-2009, 07:51 PM	#5
Polarbear Polarbear Join Date: Jan 2006 Location: Clovis,CA Posts: 1,790	Both ends; FD and Tranny here, I use the same 75-140. The two oils are NO different 75-90 vs 75-140w! The latter can handle MORE heat stress, thats all and thicken as needed, when things get really hot. Your FD/Tranny should never get there. Randy

11-07-2009, 05:23 AM	#6
kthutchinson Registered User Join Date: May 2007 Posts: 42	I asked why the change because I'm apparently 2 changes behind. My hexhead RepROM, 5th edition, dated 02/2007, says use SAE 90 GL 5 hypoid gear oil. So I missed the change to 75W-90 AND the subsequent change to 75W-140. __________________ Karl 2007 R1200ST