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GR86 General Topics (2nd Gen 2022+ Toyota 86) General topics for the GR86 second-gen 86 |
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09-06-2023, 05:41 PM | #29 |
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Just because 275-300 is maybe ok doesn't mean it is ideal. Your oil WILL start breaking down at those temperatures. How about running that known-good synthetic 30- or 40- weight, with a simple air to oil cooler at 200-230 temps for maximum reliability?
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09-06-2023, 06:26 PM | #30 |
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Oil doesn't necessarily breaks down at those temperatures. It depends on the oil, people have had good results in UOA after 5k miles and hitting 300 few times on M1 FS 0W-40. Sure I want maximum reliability but I don't think oil cooler means maximum reliability.
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09-06-2023, 08:56 PM | #31 |
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pretty wild to think that some of these people run their engines above 230+
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09-06-2023, 09:24 PM | #32 | |
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cSt at 100C is a bit thin though. FWIW I asked for 5w30 and Subie service desk guy said "no prob", but after I got this report I went back and looked at the invoice and it listed 0w20, in retrospect not surprising the techs put in the oil Subaru dictates... Last edited by ZDan; 09-06-2023 at 09:41 PM. |
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09-06-2023, 09:27 PM | #33 |
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Not as wild as running at oil pressure of 46psi or lower at 6500 rpm at 230. 46 psi is with air to oil cooler, the coolant-oil cooler has even bigger pressure drop. I don't think engine is built for pressure drops, at least quality euro spec or full saps oils are made for high temperatures (as high as 300F on non racing oil).
Last edited by ruturaj001; 09-06-2023 at 09:38 PM. |
09-06-2023, 10:20 PM | #35 | |
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A quality conventional motor oil will tolerate oil sump temperatures up to 250 degrees, but starts breaking down over 275 degrees. A full-synthetic oil will withstand sump temperatures in excess of 300 degrees https://www.motortrend.com/how-to/en...0260%20degrees. Last edited by ZDan; 09-06-2023 at 10:59 PM. |
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09-07-2023, 10:26 AM | #36 | |
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I'm sure you read this from that article "The traditional approach is to try to hold oil temperatures between 230 and 260 degrees".
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09-07-2023, 01:10 PM | #37 | |
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The Following User Says Thank You to ruturaj001 For This Useful Post: | ZDan (09-07-2023) |
09-07-2023, 01:24 PM | #38 | ||
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https://www.motortrend.com/how-to/en...0260%20degrees. "A quality conventional motor oil will tolerate oil sump temperatures up to 250 degrees, but starts breaking down over 275 degrees. The traditional approach is to try to hold oil temperatures between 230 and 260 degrees." They're talking about non-synthetic, and they're talking about oil temperature in the pan. Regarding synthetic: "A full-synthetic oil will withstand sump temperatures in excess of 300 degrees, and for hardcore professional racing, some oval-track race teams are experimenting with ultra-thin, specially formulated, race-only synthetics operating at 350 degrees or even higher." |
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09-07-2023, 01:29 PM | #39 |
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So you'd recommend that I uninstall my oil cooler (HKS) for track driving, as long as oil temps don't exceed 300*F?
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09-07-2023, 02:14 PM | #40 | |
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Do you track the car? Personally, if I turbo'd mine, I'd first see what the oil temps did at the track without a cooler first, and if they stabilized comfortably below 300F then I probably wouldn't bother with one. Above 285F I'd definitely go to 40 or 50 weight though. |
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09-07-2023, 02:31 PM | #41 |
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Might be best to evaluate using pressure sensor. Then consider pressure at different temperature and RPM with and without an oil cooler, and if it actually reaches 300F.
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09-07-2023, 04:01 PM | #42 | |
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That's where I'm sorta coming from. Its not hard to ensure an oil cooler isn't leaking or having vulnerable lines. So with that said...seems oil temps of 220-240 are highly preferred (although not necessary) compared to 280-300F.
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