06-25-2021, 11:14 AM | #15 | ||||
Drives: 2019 ZL1 Riverside Join Date: Apr 2020
Location: Charlotte, NC
Posts: 1,138
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BMW may have spec'd the thicker oil for the same reasons discussed here, although I still think it's a little crazy. Although dry sump is more expensive, it's a vastly superior solution compared to the "band aid" of high viscosity (which does more harm than good - plus the crazy high oil pressures which may contribute to early oil pump failures) Quote:
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06-25-2021, 01:19 PM | #16 | |
Drives: 2018 Hyper Blue ZL1 1LE Join Date: Dec 2018
Location: CA
Posts: 1,360
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You know several E46 M3 owners who run 5w30 oil on track and they determined, against the reco of some of the best auto engineers in the history of the industry, that 5w30 is better? I'm not sure what to say about that. All the top E46 M3 track-rats here in So Cal run 10w60, and there are a lot of them. They're hammering these motors on 100 degree days, and some have over 100K miles. Like any car you will get some normal bearing wear over time, but if your motor stays strong over 100k under these conditions, and theirs have, it's performing and lasting as designed. None of these guys would or should use 5w30 under these conditions. GM Corvette race teams use M1 0w50 Race oil, is it too thick? Professing to be an oil expert who knows more than world class engineering and racing teams (BMW and GM) who built some of the best cars and motors in automotive history is not something I recommend. Bob is the Oil Guy forum is a better place for a never ending and pointless discussion like that. |
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06-25-2021, 02:47 PM | #17 |
Drives: 2019 ZL1 Riverside Join Date: Apr 2020
Location: Charlotte, NC
Posts: 1,138
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0W-50 is still thinner than 15W-50 (or worse yet 10W-60), it's a significant difference.
BMWs call to run 10W-60 with extremely tight bearing clearances in the M3 is off the rails insane, and I'm not the only one who thinks that...hope you are babying the heck out of the engine until it's completely up to temp (i.e. oil temp gauge). I would be running 0W-40. Modern synthetics are so good that viscosity loss isn't the problem it once was (assuming fuel dilution is in check, which can be a problem for boosted applications). You may want to get a used oil analysis for viscosity and wear metals |
06-26-2021, 07:21 AM | #18 | |
Oh Oh it's Friday Night!
Drives: 2018 ZL1 1LE Nightfall Gray Join Date: Jan 2018
Location: Walton Woods
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2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm
Four that wanna own me Two that wanna stone me One says she's a friend of mine... |
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06-26-2021, 10:08 PM | #19 | |
Drives: 2018 Hyper Blue ZL1 1LE Join Date: Dec 2018
Location: CA
Posts: 1,360
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In my ZLE I almost exclusively run the awesome factory engineer required 15w50--without this, at oil temps in the 270 F+ range on track my pressure, viscosity and film strength would be too compromised for comfort running on a 100 degree day at Buttonwillow on Pirelli slicks. Peak pressure drops a lot with oil temps this high on track and in logs, more so with lower weight oils. I have observed the data firsthand repeatedly. And if my motor failed on track with anything but M1 15w50 in it, I would not be covered by warranty--full stop. If I had a non 1LE I COULD run 0w40, but I wouldn't due to my preference for better pressure at high temps. If I modded my ZLE I'd be anxious about failures out of warranty and would be getting oil analysis, but the ZLE doesn't need any mods to lap a lot fast than I can currently pilot it. I have a full warranty and will sell the car before it expires, so no need to worry about oil analysis. If you meant get oil analysis on my 2002 M3, that bad boy is long gone--I should have kept it. |
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06-26-2021, 11:44 PM | #20 | |||
Drives: 2019 ZL1 Riverside Join Date: Apr 2020
Location: Charlotte, NC
Posts: 1,138
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Is there a connection between these thick oils and early pump failure? Who knows, but it's definitely more stress on the pump. One thing for sure, higher viscosity oil doesn't flow through close tolerance parts as well. Note that Honda now specifies 0W-20 (!) in the high boost turbocharged Type R, which is a very high stress engine - maybe Honda doesn't know what they're doing? Or maybe BMW didn't....oil is not a static science |
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high pressure, oil pump, track |
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