Gear oil vs UDT in front axle

Again - not to open Pandora's box on oils ............ the secret to old sloppy engines is to use a HIGH viscosity oil that will "fill" those wonderful gaps between those sloppy moving parts! Synthetics can be made to flow freely at 0 weights and they make a nasty 60w straight synthetic that is used in dragsters that is almost like molasses!(ok - that was a stretch!)

The unfortunate truth is that most all oils within a certain range will a viscosity of water when they have been heated to 100c

As for switching back and forth ...... that too have been around a long time, as well as "allow the engine to break in before using synthetics...."

funny how we have gone from flat earth to round earth to some in the flat range again!

The real truth - ANY oil you pick up in the last 10 years will work in almost any circumstance - oil today is lightyears advanced as to what it was 70 years ago. The scientists that make the stuff - are working on the molecular level ...... hell it will not be long before some company produces a nanobots that can go INTO an engine and somehow rebuild those places that need a lot of TLC all the while in the oil !!!

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I don't think viscosity change at temp extremes is a big deal on a 4wd front axle like it would be in a transmission where you are trying to shift manually or a hydro trying to pump fluid. What would matter to me is the ability of the lube to remain between 2 surfaces under pressure.....don't remember the name for that test but that's what keeps gears from wearing....a lubricating layer between steel surfaces.....not a petroleum engineer. I have been a heavy oil guy all my life until I bought a Dodge 4.9 (or 4.7...one's Chevy the other Dodge) and they insisted I use 5w-30. Sad the oil pump was made for light oil and the pressure did stay up when hot like I used to get with heavy viscosity oil in my prevous 318 and 360. Then comes the '09 with a hemi and it emphatically stated 5w-20 and made the same comment about the oil pump. It was also a 8/4 engine and the manual said the conversion can malfunction with thicker oil. Had no problems with reliability, oil burning, nor low oil pressure with the thin oils....used Mobil 1.

I use Premium Universal Trans/diff/wet brake/hydro oil in my main sump on my Branson and also in the front axle sump per the mfgr recommendation. Takes about 2.5 gallons there and about 10 in the rear so I buy one oil and it does both jobs. Can't complain. I even started using light oil in my vintage Fords and have smoother shifting, much easier in winter, no noticeable increase in leakage and since the main sump uses JD 303/Ford 134A now my trannies doe too. These tractors don't have wet brakes and hydros and don't need the Premium and I save a few bucks. Now you know what I know for what it's worth.

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