gearbox oil - Page 2 - ZR-1 Net Registry Forums

jss06c6 · 02-18-2018

Quote:

Originally Posted by daviddu79

the problem, in France we do not find the oil CASTROL

You should be able to find the BMW oil I indicated... Works very well in my '91.

Sent from my XT1585 using ZR-1 Net Registry mobile app

Marc Haibeck · 02-18-2018

Technically rear axle gear lubricant should not be used in the ZF S6-40. The synchronizer rings are a phosphor bronze alloy. The EP additive in hypoid gear oil attacks the phosphor bronze material. This is why GM used a Texaco motor oil with some additives deleted for the GM transmission lubricant. The ZF service publication specifies that Castrol motor oil can be used.

I have never heard of a problem from running gear lubricant in the 6S-40. However, since specialized manual transmission lubricants are available from Amsoil and Red Line, it's best to use these high quality products.

lfalzarano · 02-19-2018

What weights of the Amsoil and Red Line do you recommend for our transmissions?

Sent from my iPhone using ZR-1 Net Registry

Marc Haibeck · 02-21-2018

The Amsoil MTFQT product is 5W-30 just like the GM lubricant was.

Red Line recommends 10W-30 motor oil SKU 11304. I believe that 10W-30 viscosity is good for 20 degrees ambient and up.

02-18-2018	#12
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 250	Re: gearbox oil Technically rear axle gear lubricant should not be used in the ZF S6-40. The synchronizer rings are a phosphor bronze alloy. The EP additive in hypoid gear oil attacks the phosphor bronze material. This is why GM used a Texaco motor oil with some additives deleted for the GM transmission lubricant. The ZF service publication specifies that Castrol motor oil can be used. I have never heard of a problem from running gear lubricant in the 6S-40. However, since specialized manual transmission lubricants are available from Amsoil and Red Line, it's best to use these high quality products.

02-19-2018	#13
lfalzarano Join Date: Feb 2011 Location: Clayton, North Carolina Posts: 1,133	Re: gearbox oil What weights of the Amsoil and Red Line do you recommend for our transmissions? Sent from my iPhone using ZR-1 Net Registry __________________ Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR]

02-21-2018	#14
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 250	Re: gearbox oil The Amsoil MTFQT product is 5W-30 just like the GM lubricant was. Red Line recommends 10W-30 motor oil SKU 11304. I believe that 10W-30 viscosity is good for 20 degrees ambient and up.