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07-18-2016, 03:27 PM | #23 | |
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07-18-2016, 03:46 PM | #25 | |
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07-18-2016, 04:46 PM | #26 | |
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07-18-2016, 05:00 PM | #27 |
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np
I have one for used oil, one for transmission fluid and one for diff fluid |
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07-20-2016, 12:13 PM | #28 | |
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Any auto parts store will send a cheap hand pump for < $20. Can easily be reused for tons of things around the house, too.
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06-29-2018, 04:17 PM | #29 |
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jeez - is there a reason 75w140 is required? car will be used for autox and HPDEs, was thinking about using 75w110. Not sure what is special about this diff compared to others that it needs 75w140. I think RL's 75w110 is a little thicker than most also
seems Turner's project M3 used 75w110: http://www.bimmerworld.com/E92-M3-Track-Project-Car/ Last edited by kyoo; 06-29-2018 at 04:34 PM.. |
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06-29-2018, 04:39 PM | #30 | |
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The reason 75w140 is required is because BMW says so. They don't just arbitrarily select a viscosity. If you feel like you know better than BMW and GKN (who builds the LSD), and you have spare cash if it blows up, feel free to run 75w110 or whatever. And FWIW, the E46 used the same unit and required 75w140 even back then. The fact that you are going to be using it for the track is even more reason to run a stout fluid like 75w140.
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06-29-2018, 04:55 PM | #31 | |
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I've seen a lot of built cars that run the thickest fluids possible because it's the safe/easy button to "prevent something from going wrong," - and doing other things, like sticking with the factory fill because "they know what they're doing," - enough to the point that I ran virgin oil samples on all the common diff fluids ran (https://qlmotorsport.com/2016/02/15/...0345-oil-test/). Turns out there's nothing special about those factory fills, sometimes it's just to quiet things down. a few cars i've seen even that come with clutch diffs have the plates deactivated from the factory just to shut them up. hopefully it goes well. if i notice anything seem off early i'll flush in 75w140. |
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06-29-2018, 05:11 PM | #32 |
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"As thin as possible but as thick as necessary"
You are correct that a thicker fluid is not always needed and creates problems of its own, but why someone would go against the OEM recommendation [on a stock car] that has worked fine for tens of thousands of units for tens of thousands of miles each is baffling. A single UOA after 1 year will be of limited use. The whole point is to establish a baseline and look for deviations from that.
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06-29-2018, 05:21 PM | #33 | |
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i also sent bimmerworld a msg to see why they chose the red line 75w110 in their project track car also. not sure if i'll hear back from them, but curious their reasoning. Last edited by kyoo; 06-29-2018 at 05:35 PM.. |
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07-02-2018, 09:24 AM | #34 | |
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FWIW, here's a response from Bimmerworld on why they chose to go with a 75w110 on their track car:
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07-02-2018, 10:30 AM | #35 | |
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For a car going to HPDE and doing 20 minute sessions and then cooling off for an hour or more, the heat thing is less of an issue.
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07-02-2018, 10:44 AM | #36 | |
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Anyway, we'll see how it goes for my specific use. |
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