icanfixall
Official GMM hand model
I have around 200,000 miles on my gear oil and want to upgrade to syntheic oil. Which oil would be recommended here...
Differantial Oil Questions
- Thread starter icanfixall
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EMD_DRIVER
Say what?!?!
I've always heard good things about AMSOIL....
i wouldn't do it if I were you. You just might be doing a set of axle and pinion seal too.
icanfixall
Official GMM hand model
Not a daily driver but I do haul heavy and fast sometimes. The Accord gets 30 mpg and the truck gets 19 mpg. The Honda is cheaper to drive but not a fun driver being so close to the ground and semi tires.
Not a daily driver but I do haul heavy and fast sometimes. The Accord gets 30 mpg and the truck gets 19 mpg. The Honda is cheaper to drive but not a fun driver being so close to the ground and semi tires.
I would normally recommend the Amsoil 75w90 Severe Gear ( that's what I run ) but considering your climate and those killer mountains on every side and the precious cargo you like to haul, the 75w110 severe gear might be a better choice for your truck for a little added protection ( make that overkill
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DragRag
Registered User
Every time I have tried to use an synthetics on any vehicle with mileage on it I sprout leaks. I have given up on synthetics all together due to there costs, with no real advantages, and the fact that anything I put it in develops a leak.
sle2115
NRA LIFE MEMBER
On the contrary, I have converted many vehicles to synthetic with no leak issues. My truck had 136,000 on it when I got it and I immediately switched everything but the engine to synthetic. I run Royal Purple in mine cause it's readily available. Have no problem with Amsoil either, sold it and ran it for years, but no one around here seems to stock it, and if they do, it's double everything else.
For diffs , trannys , and transfer cases, I recommend the same thing as for engines. Before doing the switch, run a treatment of Auto RX. It will revive the old seals and prepare them to where they won't gush the synthetic out all over the place . For diffs, you put 2 oz of the stuff in per qt of oil and run it for 1000 miles, then drain it and do the change. That stuff is VERY effective. if it doesn't do the job, your seals were on their way out anyway.
DragRag
Registered User
Food for thought....
fury9
Full Access Member
dang, 30 for a bottle of gear oil?? Too bad I can't get one of those oil filters for my truck though
sle2115
NRA LIFE MEMBER
Not sure where you are buying it at, but I'm buying RP Gear Oil for about $7 per quart, that's $21 per axle or so. Not sure on the filter you speak of.
icanfixall
Official GMM hand model
My thinking about changing the gear oil to synthetic is too gain some mileage. I get between 18 to just short of 20 mpg running 75 to 85 mph and in double overdrive at 1700 rpm... I know I could get better miles per gallon if I slowed down but... Thats just not fun...
sle2115
NRA LIFE MEMBER
My thinking about changing the gear oil to synthetic is too gain some mileage. I get between 18 to just short of 20 mpg running 75 to 85 mph and in double overdrive at 1700 rpm... I know I could get better miles per gallon if I slowed down but... Thats just not fun...
Can't help you with that. I've never really measured the MPG on mine, just drive it occaisionally, but can tell you out on the road, it's prolly less than half what you are getting!
Straight 1:1 and 4.10's don't do much for mileage no matter what you have for lube! I can tell you my tranny seems to shift much smoother as well. I started running synthetics after doing to maintenence on LEO vehicles at the machine shop. Several branches spec synthetic and after many hard miles, the inside of the engine looked and measured like new. So for those that say there is no advantage, they should look at the internals after using it. Mileage was just an additional benefit to me in mine.I just changed my diff oil the other day and put plain ol 80w90 in it. should I have used something else? my truck is always loaded, weighs over 8000 everyday and do quite a bit of freeway cruising with the occasional trailer behind. I should say the main reason for the 80w90 is I had a 5 gal bucket of it!
