01-24-2021, 09:29 AM | #43 |
Shifts under load
Drives: 2020 Camaro 1SS 1LE rally green Join Date: Apr 2017
Location: Fuquay-Varina, NC
Posts: 1,295
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Dang, Rockauto makes it so easy. No reason to buy anywhere else unless you're in a hurry.
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24 Audi S3 prem plus, sport package
HPDE - southeast - JTI- solo, PCA- blue. 22 Suzuki GSX-S 1000GT blue |
01-24-2021, 09:53 AM | #44 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
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01-24-2021, 09:57 AM | #45 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
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01-24-2021, 10:04 AM | #46 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
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01-24-2021, 10:15 AM | #47 | |
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
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Matt Miller
2020 SS 1LE |
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01-24-2021, 10:38 AM | #48 |
Drives: 6th gen Join Date: Aug 2013
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Track club is not wrong about the cats either
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‘22 2SS 1LE M6 Summit White - RF, Flexfuel, LT2 intake, 95mm tb, ATI udp, VT ramair, full 28” dragpack - 11.68@122
‘16 1SS M6 LT2 intake + boltons on DR 11.0@126+ (Sold) Last edited by 6spdhyperblue; 01-24-2021 at 01:24 PM. |
01-24-2021, 11:00 AM | #49 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
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Otoh, too much cold start winter protection in summer is not necessarily a good thing. I would argue, that 5w is much better for summer use than 0w, as it will actually offer more protection during starts (because of higher viscosity). 15w50 is not permitted for DD, NOT because it doesn't offer proper cold start protection. GM makes no claim not to use this oil for track based on ambient temps. Some may track their car at 10C ambient and this oil is perfectly fine for that. The issue is not the 15w, but rather the w50, which is very high in zinc. Read: it would destroy the cats prematurely during regular DD driving. Cheers! |
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01-24-2021, 12:31 PM | #50 | ||
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
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So the idea that oil with a cold-start viscosity of 79mm2/s (5wXX ) is somehow protecting better than one at 69mm2/s makes no sense. Both of those viscosities are several times higher than the engine manufacturer want. That's exactly why 0w oils exist: to protect modern, small-clearance motors better during cool/cold starts. Quote:
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Matt Miller
2020 SS 1LE |
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01-24-2021, 12:52 PM | #51 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
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I disagree that 15w offers inadequate cold start up protection. If that were the case GM would never put it on the list as it would cost them motor warranties. That weight is designed to protect start ups at minus 10C. I dont think anyone sane would track their car at that temp. 900 vs 1200 zinc is a huge vs minor difference as far as cats go. That's a major consideration for a Dexos2 certification, as GM warranties emission systems for 8 yrs by law. Sure, race oils are something else altogether, but so are race motors, lack emissions, lack of any warranties altogether, etc. So apples to bananas type of comparison Cheers! |
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01-24-2021, 01:23 PM | #52 |
CamaroFans.com
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I member that but wasn't that before Corvette went with 0W40.
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01-24-2021, 01:59 PM | #53 |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
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8I believe it was right after, when folks questioned 0w40 vs 5w40 and hence they both addressed that very specific question.
Lest we forget, the original factory fill was 5w30 for 2 or 3 yrs while 0w40 and 5w40 were officially approved as track/dd oils (plus 15w50 for ZLE of course, because of G3Rs and for track only). Since then, NOTHING has changed with LT1/LT4 except for a marketing deal with Mobil1. IMO, the issue GM was addressing here, was a fact that their dealers carried nothing but 5w30 for both cars. So they were losing a piece of the market, plus profit margins present with more expensive oils (let's not forget how dealers make money). The 0w40 ESP Formula was specifically developed for a Vette and adopted as factory fill for both cars. However, GM does not mention Mobil1 anywhere in the manuals. So, they are super comfy leaving a brand choice to ourselves, as long as the oil meets Dexos2. Of course, if one takes it to a dealer, they will pay the highest possible price for an oil change (after 2 free fills). As much as many may go this route and as much as Mobil1 marketing (at least in the early days), suggests there is no better oil for these cars, it sure looks like GM is not really prepared to make such claims. NB I had been using Valvoline MST 5w40 until they changed the recipe, then switched to Motul 5w40 Dexos2. I see absolutely zero reason to pay twice the cost only to have -40C vs -30C protection, neither of which my car will ever experience even remotely. Cheers! Last edited by TrackClub; 01-24-2021 at 02:07 PM. Reason: Grammar |
01-24-2021, 03:38 PM | #54 | ||
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
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Why would someone go through the trouble and expense of following GM's recommendation for track oil in a ZLE but then brush off their recommendations aside for street use? The manual for 2020 says that 15w50 is "is required [for track use] in the ZL1 1LE, but after track use must be changed back to 0W-40 dexos2 for street use." For an LT1, it specifies 0w40 for street use and either 0w40 or 15w15 for track use. Nowhere in either manual does it say that 5w40 should be used for any purpose.
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Matt Miller
2020 SS 1LE |
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01-24-2021, 04:55 PM | #55 | |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
Location: Canada, eh!
Posts: 5,091
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0w is a winter rating. Yes it is lower viscosity, which excels in low winter temps, but in summer time, it is not just the speed of flow that counts, but viscosity. And higher viscosity is by all means better in higher summer temps. So...you suggested some 44% higher zinc is "little", but all of a sudden 14% of what is likely a millisecond is now huge? Let's play fair, eh? If 5w viscosity was somehow inferior for summer starts, sure as heck GM would never approve 15w oil for ANY use whatsoever. Nor approved 5w30 as **all year round** dd oil. In that vain, GM states ZLE must use 15w50 to avoid possible pick up issues, yet tons of ppl run G3R and even full slicks on zl1s and ss 1les with w40 oils with zero issues. You are correct, there is no 5w40 mentioned in 2020 manual, but it was mentioned in previous year manuals and it is still mentioned in the official track prep manual dated 2019 (haven't checked the 2020). NOTHING has changed with LT1 or LT4 motors since gen6 inception. My 2017 manual said Valvoline 5w40. Heck, even 2020 manual says 5w30 for dd all year round. Finally, both Big Al and Tadge have publicly stated, in writing, that 5w40 is fine. So what exactly is the issue here? Again, my point is this: i see ZERO reason to pay TWICE the price just to run 0w40 vs 5w40 in summer time. And if i just dd my car i would run 5w30 and save even more $. Per OFFICIAL GM RECOMMENDATION. Cheers! |
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01-24-2021, 06:06 PM | #56 | ||||
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
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If the only reason you want to run a 5w oil is to save money, then I can't argue with that because one choice isn't "better" than another when it comes to a cost:benefit decision. Earlier in this thread I noted that Rockauto sells M1 0W40 ESP for $6.72/qt. What other Dexos 2 5w30 or 5w40 can you get for half that price? The cheapest I've seen is the Amalie stuff at about $5.50/qt, so these days M1 is nowhere near twice the price. For $1.22/qt difference, to me it makes sense to run the specified oil. But that's just me. *I screwed up the amount of zinc in both! 15w50 has 1300ppm zinc, but 0w40ESP has 990.
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Matt Miller
2020 SS 1LE Last edited by Msquared; 01-24-2021 at 09:11 PM. |
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