Differential Fluid Question
#1
Full Member
Thread Starter
Differential Fluid Question
I was getting ready to change my differential fluid and, as always, I can never seem to remember which oil to use, so I came here to do a quick search.
There are the typical discussions of the best brand (Neo, Redline, Royal Purple, etc.), but most everyone seems to be using a 75w90 weight oil.
Figuring that I might be well advised to take another look at the shop manual, it has the recommendations as follows:
API Service GL-4 or 5
Above -18°C (0°F): SAE 90
Below -18°C (0°F): SAE 80
So my question: Is anyone using a single weight gear oil in their differential or is 75w90 the way to go?
Thanks!
There are the typical discussions of the best brand (Neo, Redline, Royal Purple, etc.), but most everyone seems to be using a 75w90 weight oil.
Figuring that I might be well advised to take another look at the shop manual, it has the recommendations as follows:
API Service GL-4 or 5
Above -18°C (0°F): SAE 90
Below -18°C (0°F): SAE 80
So my question: Is anyone using a single weight gear oil in their differential or is 75w90 the way to go?
Thanks!
#3
Moderator
iTrader: (7)
I was getting ready to change my differential fluid and, as always, I can never seem to remember which oil to use, so I came here to do a quick search.
There are the typical discussions of the best brand (Neo, Redline, Royal Purple, etc.), but most everyone seems to be using a 75w90 weight oil.
Figuring that I might be well advised to take another look at the shop manual, it has the recommendations as follows:
API Service GL-4 or 5
Above -18°C (0°F): SAE 90
Below -18°C (0°F): SAE 80
So my question: Is anyone using a single weight gear oil in their differential or is 75w90 the way to go?
Thanks!
There are the typical discussions of the best brand (Neo, Redline, Royal Purple, etc.), but most everyone seems to be using a 75w90 weight oil.
Figuring that I might be well advised to take another look at the shop manual, it has the recommendations as follows:
API Service GL-4 or 5
Above -18°C (0°F): SAE 90
Below -18°C (0°F): SAE 80
So my question: Is anyone using a single weight gear oil in their differential or is 75w90 the way to go?
Thanks!
Get the highest performance synthetic "gear" oil with GL-5 or better for the diff since there is no brass and you want the maximum EP performance for that hypoid gearset.
David
#4
Full Member
Thread Starter
Thanks for the replies!
At this point I will go with a multi-weight. I have it narrowed down to 3:
- Redline 75w90 Gear Oil
- Royal Purple 75w90 MaxGear
- Amsoil Severe Gear 75w90
At this point I will go with a multi-weight. I have it narrowed down to 3:
- Redline 75w90 Gear Oil
- Royal Purple 75w90 MaxGear
- Amsoil Severe Gear 75w90
#5
Where has my $ gone?
iTrader: (12)
Join Date: Feb 2004
Location: Bay Area, Cal/Phoenix, AZ
Posts: 1,654
Likes: 0
Received 7 Likes
on
2 Posts
Its funny that when I first got an RX-7 I only used Redline for the diff for awhile, then I started using Royal Purple for awhile , and now I use Amsoil. (In that order, no other oils).
#6
Full Member
Thread Starter
Did you notice any difference upon each switch? Do you recommend the Amsoil over the others?
Thread
Thread Starter
Forum
Replies
Last Post