Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - changing to a different differential fluid weight.

ConnClark · 10-18-2022, 02:54 PM

So my car manual says I should use 85w-90 gl4+ differential fluid in my front and rear differentials. I decided to switch to 75w-90 GL5 synthetic.

According to this I should be good on protection and pick up a 0.5% fuel economy gain.

https://www.fleetequipmentmag.com/sk...nner-gear-oil/

Any thoughts?

10-18-2022, 02:54 PM	#1 (permalink)
ConnClark DieselMiser Join Date: Jun 2008 Location: Richland,WA Posts: 985 Das Schlepper Frog - '85 Mercedes Benz 300SD 90 day: 23.23 mpg (US) Gentoo320 - '04 Mercedes C320 4Matic 90 day: 22.44 mpg (US) Thanks: 46 Thanked 231 Times in 160 Posts	changing to a different differential fluid weight. So my car manual says I should use 85w-90 gl4+ differential fluid in my front and rear differentials. I decided to switch to 75w-90 GL5 synthetic. According to this I should be good on protection and pick up a 0.5% fuel economy gain. https://www.fleetequipmentmag.com/sk...nner-gear-oil/ Any thoughts? __________________