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10-24-2015, 06:16 PM | #1 |
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Diff fluid
Gotta do my diff soon, prob next weekend. I have a bottle open from 2 years ago, if it stays in the bottle, does it degrade or I can still use it ? its redline 75w90 gear oil
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10-24-2015, 06:29 PM | #2 |
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You can still use it
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10-25-2015, 05:34 AM | #6 |
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The main reason for shelf life is moisture getting into the oil.
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10-25-2015, 09:22 AM | #7 |
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need someone with more chemistry background in this..
if you open a bottle and use x amount, close it, throw it in storage for 2 years, does moisture get in ? i figure plastic bottle is non porous, so nothing get in or out.. but who knows.. water molecules might some how find its way in
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10-25-2015, 10:32 AM | #8 |
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Oils (motor oil, tranny fluid, diff fluid, etc.) and greases are generally hydrophobic which means they repel water. It's brake fluid which is hygroscopic (attracts and holds water) that you have to worry about storage after breaking the factory container seal.
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10-25-2015, 10:41 AM | #9 | |
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10-25-2015, 05:26 PM | #11 |
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As long as the lid has been on, there is no real moisture, only the moisture that was in that air when it closed. And that is generally very little.
Moisture is generally not a real problem, as the diff itself has much more potential to get some moisture inside. The diff has a breather hole, so every time when the diff gets warm/cold it sucks in a bit of fresh air and some moisture. (without a breather hole the diff would be weeping from the gaskets all the time as when it warms up the pressure inside would rise and that is a sure way to get oil leaks) And in that system it is supposed to be 'lifetime oil', so compared to that 2 years in a closed bottle is nothing. Even brake fluid is generally useable for a very long time as long as the lid/cap closes good.
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10-25-2015, 07:34 PM | #12 |
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so funny thing, i went to grab my redline, it was close to empty.. guess i wont have to worry about it.. have to order a new bottle.. lol
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10-26-2015, 05:10 AM | #13 |
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Convenient topic....
So I may change my diff fluid today on my '08 Z4 Coupe. I plan on using BMW's current SAF-XO 75W-90 diff juice (it's what my '06 E90 325i takes). I'm assuming both diffs (the E90 and Z4) use the same spec oil? Can anyone confirm? Thanks in advance.
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10-26-2015, 09:55 AM | #14 |
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10-26-2015, 09:57 AM | #15 |
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E90 - pretty much any 75w90 that is bmw spec
http://www.pelicanparts.com/BMW/tech...eplacement.htm
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10-26-2015, 08:28 PM | #16 |
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lol....good timing with this. I have a plastic jug (a reused jug...so no foil seal like a new bottle) filled w/ diff fluid from the dealer. I got it a few years ago but never got a chance to do the work (1st it was time, then not having the right stubby hex driver, then time...). It's been sitting in the closet under my stairs all this time. Sounds like it should still be usable.
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10-27-2015, 09:26 PM | #17 | |
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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10-27-2015, 09:44 PM | #18 |
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nice, i gave the mailman a break, i didn't prime my bottle, its coming monday after weekend... was hoping to do it during this coming weekend
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10-28-2015, 01:28 PM | #19 | |
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Shelf life can be adversely impacted by improperly storing the fluid (as in storing it in an open container, in an environment with high humidity and large temperature variations). The condensate can react with the additives.
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10-30-2015, 12:30 PM | #20 | |
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