Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Difference between 75-90 and 90-140

Miller88 · 03-15-2014, 12:46 PM

I drive my Jeep very infrequently, so my fuel economy data isn't that accurate. However, with 85w-140 it wouldn't creep in gear when cold. It also felt like the brakes were dragging unless I drove it until the fluid got warmed up.

The 80w-90 is a much better choice (for me) year round. It's also what is recommended in the owners manual. I was running it only because I had a bad front pinion bearing that was leaking. So I decided it would be a good idea to put it in both front and rear differentials.

I changed back to 80w-90 last summer.

What about a 75w-140? The 85w-140 was a "dino" oil.

03-15-2014, 12:46 PM	#3 (permalink)
Miller88 Master EcoModder Join Date: Jul 2008 Location: NY state Posts: 501 XJ Cherokee - '00 Jeep Cherokee Sport 90 day: 12.96 mpg (US) FoFO - '11 Ford Focus SE 90 day: 36.78 mpg (US) Thanks: 1 Thanked 51 Times in 38 Posts	I drive my Jeep very infrequently, so my fuel economy data isn't that accurate. However, with 85w-140 it wouldn't creep in gear when cold. It also felt like the brakes were dragging unless I drove it until the fluid got warmed up. The 80w-90 is a much better choice (for me) year round. It's also what is recommended in the owners manual. I was running it only because I had a bad front pinion bearing that was leaking. So I decided it would be a good idea to put it in both front and rear differentials. I changed back to 80w-90 last summer. What about a 75w-140? The 85w-140 was a "dino" oil. Last edited by Miller88; 03-15-2014 at 01:15 PM..