oceanblue2019
Well-Known Member
- First Name
- John
- Joined
- Apr 13, 2019
- Threads
- 23
- Messages
- 3,168
- Reaction score
- 4,922
- Location
- Northern Arizona
- Vehicle(s)
- 2019 JLUR 2.0L Auto
- Occupation
- Consultant
- Thread starter
- #1
Interesting finding from the local Jeep club wrench weekend. What better way to spend a hot Sunday then wrenching on Jeeps and teaching newbies how to be a bit more self-sufficient?
Anyhow we had a 2020 JLUR 2.0L that had a lift and 35's and some other parts added from the dealership. Lift was MetalCloak, with MC diff covers/skids.
Anyhow this Jeep was to get a gear oil change at 35,000 miles so the owner showed up with the fresh fluid and ready to learn.
What was interesting is the owner was complaining about lower mileage then expected - in the 17's to 18's on the highway - versus what most 2.0's are doing - 20's to 22's on similar tires/lift/etc. The owner does a lot of highway miles and Jeep runs well so always a bit of a mystery. I checked and her trip computer was at 18.2 mpg.
Anyhow, as I always do, before we dumped the front fluid to refill it I took out the fill plug and was surprised when I put my pinky in the hole it was full to that level! (Note: the MC covers fill plug is much higher than the factory - if you fill to that level it is close to 2 quarts versus the 1.3 to 1.5 required)
The rear also was overfilled.
Anyhow we dumped it all out, made sure pumpkins were clean, and refilled with 75/90 in the front and 75/140 in the rear.
I just got a text from her that she has been on the highway since 6am this morning and averaging 22.6 mpg! So random weird problem solved.
I would not have expected to loose 3 to 4 mpg due to windage drag in the pumpkins from being overfilled. I would have expected maybe 1/10th of that. This really is pretty shocking the impact.
So not only do the dealerships like 6 quarts in our engines, they also like to overfill the diffs. Pour it in until it starts to overflow and stop.
Anyhow we had a 2020 JLUR 2.0L that had a lift and 35's and some other parts added from the dealership. Lift was MetalCloak, with MC diff covers/skids.
Anyhow this Jeep was to get a gear oil change at 35,000 miles so the owner showed up with the fresh fluid and ready to learn.
What was interesting is the owner was complaining about lower mileage then expected - in the 17's to 18's on the highway - versus what most 2.0's are doing - 20's to 22's on similar tires/lift/etc. The owner does a lot of highway miles and Jeep runs well so always a bit of a mystery. I checked and her trip computer was at 18.2 mpg.
Anyhow, as I always do, before we dumped the front fluid to refill it I took out the fill plug and was surprised when I put my pinky in the hole it was full to that level! (Note: the MC covers fill plug is much higher than the factory - if you fill to that level it is close to 2 quarts versus the 1.3 to 1.5 required)
The rear also was overfilled.
Anyhow we dumped it all out, made sure pumpkins were clean, and refilled with 75/90 in the front and 75/140 in the rear.
I just got a text from her that she has been on the highway since 6am this morning and averaging 22.6 mpg! So random weird problem solved.
I would not have expected to loose 3 to 4 mpg due to windage drag in the pumpkins from being overfilled. I would have expected maybe 1/10th of that. This really is pretty shocking the impact.
So not only do the dealerships like 6 quarts in our engines, they also like to overfill the diffs. Pour it in until it starts to overflow and stop.
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