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My '21 Ram 2500 was the same way, the rear axle fluid level was down about 1" at delivery.

Swepco 201 90w would be my choice.

Your maintenance program is working well. That differential looks great inside. I removed the cover from the 9.5” differential in my suburban last summer and it looked nothing like yours. The oil looked more like crude oil than gear oil, and the magnet was 3x the normal size because of all the...

If you live in a cold climate the 75w-90 would be worthwhile, otherwise just stick with 80w-90.

5w-30 Supertech High Milesge works great in mine. 183,000 miles, uses 1 qt every 4-5K.

I suggest 5w-30 or 10w-30 "High Mileage" oil. The high mileage oils tend to be a bit thicker for a given viscosity grade, and have some seal conditioners that can be helpful for an older rig. I notice reduced oil consumption when I switched my 97 Suburban over to a high mileage 5w-30, and it...

Nice overview. I ran Pfsense (and OPNsense briefly) for a few years on a Dell Optiplex. Both were very stable, but I found the Pfsense documentation to be more thorough. To maximize the amount of time my UPS can keep my internet connection online during a power outage I looked for a less...

Did you have to do anything special to get it to boot? I occasionally see these listed on eBay with Pfsense installed.

I had the same issue on my 2001. Not returning to park is an issue with the motor. Replace that and see if it operates normally.

Your results are not ideal, but don’t panic. Do you know how long the oil was in service? It may have had a bunch of short trips. Enjoy the car and pull a sample on the next oil change.

https://www.texasrefinery.com/product-specs/pro-spec-iii.pdf

I think corrosion is more of a concern for vehicles that get parked for months at a time, especially in a damp environment. If your cars are parked inside and driven monthly that is a lot better than something being parked all winter in the Northeast. Z-Rod is a great oil, but its value for your...

Your dads engine actually has it easier than a truck that just gets short tripped around town. He should be able to get a pretty long OCI of that 0w40. What fluids are you running in the rest of the drivetrain?

This truck may have had many short trips in its life. Just driving it at operating temperature will probably help a lot. As for the MMO, the solvent flashes off pretty quickly, so 1000 miles probability isn’t any worse than 500. Cutting open the oil filter after 1000 miles will give you a good...

Probably too much. Use a grease with good washout resistance and grease at each oil change.

Beautiful car. M1 15w50 will do fine. Remove the Lucas sticker and have fun.

The recommendation to avoid heavy towing for the first 500 miles is to protect the differential. Considering you have already put about 500 miles on and the boat is only 2500 lbs I would just hook up and go. How long is it been since you checked the wheel bearings on the boat trailer?

GTX HM has been doing very well in my ‘97 Suburban with 180K miles. The old girl has never even had the valve covers off and still doesn’t leak.

Additive packages have changed a lot since 1956. I expect a TO-4 fluid in the appropriate viscosity would be fine, but I think it would be worth checking with your local Caterpillar dealer to see what they recommend. Once you know the spec. and recommended viscosity you can shop around. What...

2021 Ram 2500. Dropped FF at 16k miles, refilled with Mystik 75w-90. 2020 Ford Expedition. Drained FF at 36k miles, refiled Mystik 75w-90. 1997 C2500 Suburban. 178k on rear axle, drained AC Delco 80w-90, refilled with 80w-90 from Texas Refinery Corp. I decided to change the oil after reading...