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Thread: GL-1 Gear Oil Alternative

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    Quote Originally Posted by Deuce007 View Post
    I am wanting to drain and refill my differentials in my a3 this winter but I have been wondering what brand of Gl-5 do you recommend? After some looking I have found this GearPlusŪ SAE 80W-90 GL-5 Gear Oil and Castrol HYPOY C 80w-90 Gear Oil | Product Details | Pep Boys but I would like to know if either of these will work or not. I would prefer using Super Tech 80W-90 High Performance Gear Oil, 1 Gallon: Automotive : Walmart.com because that would be the easiest to get because I could just go to my local walmart but I would appreciate any answers.
    I'm not at all fussy about what I use in the differentials. They are open differentials, so there is no need for funny stuff like with limit-slip. I am perfectly happy with the stuff that is blended up for tractor supply, and I would imagine the walmart, or pepboys oils would be fine too. Just be sure that it is really GL5 and you will be fine.

    -Chuck

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    Sergeant Major Deuce007's Avatar
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    Quote Originally Posted by stumps View Post
    I'm not at all fussy about what I use in the differentials. They are open differentials, so there is no need for funny stuff like with limit-slip. I am perfectly happy with the stuff that is blended up for tractor supply, and I would imagine the walmart, or pepboys oils would be fine too. Just be sure that it is really GL5 and you will be fine.

    -Chuck
    OK thanks for the input. I will be heading to Walmart tomorrow so I will keep my eyes open for some GL5.

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    I don't get hung up on the high priced, big name fluids. The fact is, many of the brands come from the same place. I buy many NAPA branded fluids. I know their engine oils are Valvoline in a NAPA container for less price than the same Valvoline product.

    If you think about it, I know several people that are lazy with servicing their vehicles. They will go way,way past recommended service intervals and use the cheapest oils they can find. They tend to get thereabouts the same service life on components as I do. I try to follow recommended service intervals and use a decent fluid brand but I sometimes wonder if I'm wasting money.
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    Yeah, I don't like to buy the most expensive oil because practically any new GL5 has to be better than whats in there already.

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    I'll keep the fire going. I just changed my trans and transfer case oil this weekend with Non Detergent 40W per M35Tom's recommendation. Guess what, I got about 3 gallons of old oil to burn in the tank. My transfer case is much quieter and my transmission no longer grinds going into 4th. I'll likely upgrade to the taller overdrive when it warms up, I do like the drop in temps in my gear boxes after swapping to 40W motor oil and I stand by M35Tom's advice. Less heat and less gear whine can't be bad for anything. I guess I could pour some Lucas in it!!!
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    Lucas makes a synthetic Gl-1 50w transmission oil that is supposedly yellow metal safe. Has anyone else used this?

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    Quote Originally Posted by Slate View Post
    Lucas makes a synthetic Gl-1 50w transmission oil that is supposedly yellow metal safe. Has anyone else used this?

    Sent from my moto z3 using Tapatalk
    Ok I read through the beginning Pat of this thread and holy stuff..... maybe I shouldn't have asked and now I am more confused than ever. I'll use something and I bet it will work.

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    The transmission and the transfer case have no pumps and work in fine fashion when the nasties are allowed to drop out of suspension.
    Don't get confused about it all.
    Just put straight 30 or 40 weight in it which will not cause problems and alleviate problems, hot or cold.
    Gee, did We beat this one all to death yet?

    post 286 in here and many other places too
    https://www.steelsoldiers.com/showth...a2-oils/page19

    If you just filled it with pee it would still work Ok for a while, but think about what it is. Think 55 Chevy gearbox.
    Gee, how many gears are you flat-shifting into?
    If you want it to last another 50 years than search around these forums,
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    When this thread was hot I eagerly awaited daily updates. Hard to believe it was so long ago.

    I run 50 weight motor oil in the trans and transfer case. The sincros started working better in a 100 miles or so. It was a daily driver back then. Now I look at it after work and it seems 50 feet tall so I drive the Lincoln home instead. Just part of gettin' old.
    Have a great week
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    When I posted in this thread I still had a Deuce! I did notice a positive difference when switching to Non-Detergent 40W oil in the trans and transfer. I used "Freds" cheap oil and the truck is still pulling peanut wagons just fine for the gentlemen I sold it to. I doubt he has changed it.
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