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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Which of these 3 oils would you chose for the differential?Views : 1064 Replies : 25Users Viewing This Thread : |
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Feb 23rd, 2024, 22:40 | #1 |
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Which of these 3 oils would you chose for the differential?
All are synthetic, hypoid, GL5, Mil L 2105 B or C.
I'm inclined to get the Valvoline, but I have Liqui Moly on my M90 and I have had no issues. What would you choose? 18,25€/L 14,85€/L 12,25€/L
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Feb 24th, 2024, 00:21 | #2 |
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The cheapest one! Splitting hairs but 80w90 is what the owner's manual calls for.
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Feb 24th, 2024, 00:50 | #3 |
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still need to check whether or not the diff has LS. I can't find the damn sticker. I am assuming it doesn't. because if it does, i heard it needs LS oil
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Feb 24th, 2024, 00:58 | #4 | |
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I'm pretty sure mine is done for and I've been searching all day. If you don't know what I'm talking about, it's this part: 9463042 The rubber diaphragm goes bad and the part ain't available anymore. Some german or dutch guy found out a GM part is pretty similar but it is expensive (about 60 pounds plus shipping from US). I'm looking at diaphragms on aliexpress that might fit or be repurposed, but no luck yet. Some german dude did have the same idea and sucessfully used a rubber nipple but didn't reveal where he took it from. I already have the measurements of the thing, more or less, so I might do a mold and cast a few of those suckers in silicone, if I don't find another way, that is.
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Feb 24th, 2024, 01:33 | #5 |
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If you can get the thing apart in a non-destructive way then you have two options. Either repair the existing diaphragm with a patch and/or plasti-dip or fashion a new diaphragm out of suitable thickness nitrile rubber sheet.
I have quite a collection of failed VW/Pierburg 2e2 throttle actuators which I plan to try to repair one day along the lines of this method. https://www.landrovermonthly.co.uk/a...e-unit-repair/ Not sure whether the plastic body would make the job easier or worse. On balance, I’d probably go for new AC Delco units. The single-port vacuum bellows is Delco part number 15-71503. The twin-port vacuum bellows is Delco part number 15-71438. This Finnish forum has pictures of them and the Volvo parts side by side. https://www.vrcf.fi/foorumi/index.php?topic=25022.60 |
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Feb 24th, 2024, 01:47 | #6 | |
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Look at this. This fella dismantled the thing. It is in german, but the translator does a good enough job: https://volvo.reparaturanleitung.inf...anleitung-pdf/ And more pictures the same guy published. Here you can see how he disassembled the thing: https://volvo.reparaturanleitung.inf...kuummotor-pdf/ Mine is a twin-port, I guess. ECC. I'm gonna try to see if someone has any from a parts car. But chances it is still good seem to be slim.
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Feb 24th, 2024, 02:18 | #7 |
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I like his method of fixing it back together with machine screws and nuts around the edge. I think I’d have used J-B Weld though.
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Feb 26th, 2024, 11:41 | #8 |
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I ended up going for the Moly 75w90. Turns out the moly 80w90 is mineral and the valvoline is a blend. So I went for the 75w90 which is fully synthetic and the price today on autodoc was 16,10€/L instead of 18,25€.
Some other oils at the same price also claimed to be synthetic, but once you dig in, they never say they are fully synthetic, so you never know if it's just a blend like valvoline. Moly 75w90 was the only that had all the right characteristics and no ambiguous terms. Besides, it's not much more expensive than the mineral oils, so I think it was the best choice. 18,25€/L
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Feb 26th, 2024, 12:30 | #9 | |
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Feb 26th, 2024, 12:59 | #10 |
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