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Break in Oil for C8.25
- Thread starter Razo87
- Start date
RCP Phx
NAXJA Forum User
- Location
- Phoenix,Az
That lube is fine period, there is no break-in for bearings.
xcm
NAXJA Forum User
- Location
- Southern Oregon
Don’t use synthetic gear oil In off-road diffs.
RCP Phx
NAXJA Forum User
- Location
- Phoenix,Az
- Location
- REDLANDS, CA. (SoCal)
xcm
NAXJA Forum User
- Location
- Southern Oregon
Honest advice based on things. Take it or leave it.
Ol Blue
NAXJA Forum User
- Location
- Arvada, CO
Agreed on the non synthetic. ECGS and Currie (the manufacturers of my axles) both recommend 85W-140 conventional. The owner/mechanic of the gear shop I go to also recommended 85W-140 conventional, for a primarily off road Jeep that is not a daily driver. So that is what I use. Honestly I don't know the correct answer, but these guys are all gear and axle specialists that only do gear and axles. I trust the knowledge they have accumulated over the years. I run synthetic in all my other fluids except gear oil. If you think about it they would have a financial incentive to recommend synthetic because they could get away with a higher markup on some special proprietary synthetic blend. Instead they are recommending the cheapest gear oil out there. They also have an interest in using the gear oil that will make their gears and axles last the longest. Seems weird they would recommend something that is worse for their products. Here is some reading from ECGS and Currie on why they recommend 85W-140 conventional:
https://eastcoastgearsupply.com/ft-2536-ecgs-gear-oil-recommendation.html
www.currieenterprises.com
https://eastcoastgearsupply.com/ft-2536-ecgs-gear-oil-recommendation.html
Why Run Conventional Gear Oil?
Currie Enterprises is a premier manufacturer of high-performance direct replacement, and custom muscle car, and truck rearend axle assemblies.
- Location
- In a strange land
Interesting read.
The issue of water separation should be measurable in an objective fashion. I would think someone would publish hard data on that.
My suspicion is that the biggest issue is the frequency of fluid changes. You can get it through to folks that they need to change their engine oil, but that is about as far as most folks want to go. Changing oil in the differentials just isn't on their radar. And if someone is going to change the oil they want to do it in a manner that will push the next change as far down the road as possible, so synthetic's claims carry more weight in the decision. However, with a 4x4 the diff oil needs changed frequently, especially if there have been any water crossings. The person running synthetic is likely to be more reluctant to dump that expensive oil than is the person running cheap dino oil.
The issue of water separation should be measurable in an objective fashion. I would think someone would publish hard data on that.
My suspicion is that the biggest issue is the frequency of fluid changes. You can get it through to folks that they need to change their engine oil, but that is about as far as most folks want to go. Changing oil in the differentials just isn't on their radar. And if someone is going to change the oil they want to do it in a manner that will push the next change as far down the road as possible, so synthetic's claims carry more weight in the decision. However, with a 4x4 the diff oil needs changed frequently, especially if there have been any water crossings. The person running synthetic is likely to be more reluctant to dump that expensive oil than is the person running cheap dino oil.
RCP Phx
NAXJA Forum User
- Location
- Phoenix,Az
My experience is a little different. 45 years ago running SCORE class 1, I was having a lot of transaxle failures (091 bus box), mainly the ring/pinion when I made the switch to synthetic and that cured the problem. The other reason for the syn is usually for gas mileage!
