hello,
This is long but bear with me.
I am about to put a diff. guard on my rear end and change the shafts in my Dana 35c so I need to change the fluid again. The manaul recommends a API-GL5 SAE 80w-90 but I have been using the Redline 75w-90 which is acceptable (I hope
). The manaul also recommends using a 75w-140 if I you are towing (1000lb jetski/trailer) which I did all summer on the Redline 75w-90 (oops). I also have bigger tires and armor which add at least 500lbs. The oil doesn't look burnt or anything it has some black sooty looking stuff in it but it looks alright I guess, I might UOA it if I can get some extra money. I think it held up alright. Also I have 4.88 gears and a true-trac gear driven LSD.
So I need to decide now if I want to order more Redline 75w-90 or get Redline 75w-140. I can see the RL 14- robbing power from me in the winter because it will be so thick and I have the little 2.5L engine. But in the summer I probably will run a 140w.
Redline 75w-90 @ $7.00/quart
Redline 80w-90 @$7.00/quart
Redline 75w140NS @$7.00/quart
What is the difference between a 75-90 and an 80-90? My manaul says I should have been using the 80w90 but I've been using the 75w??
Now the other thing is what about the Amsoil gear lubes? Should I consider them? They have so many choices?
-What is the difference between their:
Series 2000 SAE 75W-90 @ $7.36/Quart
SAE 75W-90 Syn Gear Lube @ $7.36/Quart
SAE 85W-140 Syn Gear Lube @ $7.36/Quart
SEVERE GEAR (EP)(75W-90)@ $7.40/Quart
SEVERE GEAR (EP)(75W-140)@ $9.64/Quart
Should I just stick with my Redline or are the Amsoil lubes better?
Please let me know what you think is the correct choice for me. Let me know if you need any other information. BTW I'm in Ohio.
Thanks,
Seth
This is long but bear with me.
I am about to put a diff. guard on my rear end and change the shafts in my Dana 35c so I need to change the fluid again. The manaul recommends a API-GL5 SAE 80w-90 but I have been using the Redline 75w-90 which is acceptable (I hope

So I need to decide now if I want to order more Redline 75w-90 or get Redline 75w-140. I can see the RL 14- robbing power from me in the winter because it will be so thick and I have the little 2.5L engine. But in the summer I probably will run a 140w.
Redline 75w-90 @ $7.00/quart
Redline 80w-90 @$7.00/quart
Redline 75w140NS @$7.00/quart
What is the difference between a 75-90 and an 80-90? My manaul says I should have been using the 80w90 but I've been using the 75w??
Now the other thing is what about the Amsoil gear lubes? Should I consider them? They have so many choices?
-What is the difference between their:
Series 2000 SAE 75W-90 @ $7.36/Quart
SAE 75W-90 Syn Gear Lube @ $7.36/Quart
SAE 85W-140 Syn Gear Lube @ $7.36/Quart
SEVERE GEAR (EP)(75W-90)@ $7.40/Quart
SEVERE GEAR (EP)(75W-140)@ $9.64/Quart
Should I just stick with my Redline or are the Amsoil lubes better?
Please let me know what you think is the correct choice for me. Let me know if you need any other information. BTW I'm in Ohio.
Thanks,
Seth