Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
Skip & Lynne
Jedi Warrior
Offline
What weight of Red Line oil should I put in the transmission and OD. Everyone seems to like Red Line so I am going with that unless someone thinks there is something better. Skip
-
Hi Guest!
You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
There are some perks with a member upgrade!**Upgrade Now**
(PS: Subscribers don't see this gawd-aweful banner
Red Line Oil
- Thread starter Skip & Lynne
- Start date
Share this page
OP
Skip & Lynne
Jedi Warrior
Offline
Isn`t that a 90W oil? The shop manual says to use a 30W oil in both the transmission and OD. Skip
Offline
Skip,
The problem is that SAE gear oils are viscosity rated at 100 degrees F, & motor oils are rated at 210 degrees F. Thus a 30 wt engine oil is very close to a 85 rated gear oil in viscosity.
Some GL5 oils, which are intended for rear axle use due to their higher zinc content, can damage the brass parts in a transmission which is intended for GL4 rated oils.
The RL GL4 is compatible with the brass transmission parts.
Either RL MT90 or RL MTL will work well in your transmission. The MTL is a slightly lower viscosity.
D
The problem is that SAE gear oils are viscosity rated at 100 degrees F, & motor oils are rated at 210 degrees F. Thus a 30 wt engine oil is very close to a 85 rated gear oil in viscosity.
Some GL5 oils, which are intended for rear axle use due to their higher zinc content, can damage the brass parts in a transmission which is intended for GL4 rated oils.
The RL GL4 is compatible with the brass transmission parts.
Either RL MT90 or RL MTL will work well in your transmission. The MTL is a slightly lower viscosity.
D