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Old 08-07-2018, 08:00 PM   #15
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Originally Posted by Boost or bust View Post
Or, maybe it has something to do with the catastrophic oil pump failures a bunch of us have had to deal with??? All so far ha e been 2018 models with between 500-2500 miles. Warranty schwarranty...
All of us is a small % of total sales, It's not an oil viscosity related issue.

use of 40wt oil will provide superior protection to a 30wt oil at elevated temperatures.

I have met a few people at the track who do not use the proper oil in their LT1s as in they are using 5W30 so this will likely fix that issue too.
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Old 08-08-2018, 07:55 AM   #16
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The response albeit brief, makes perfect sense to me.

With oil temps in the LT4 approaching and perhaps exceeding 250F+ under heavy load, I (personally) would never trust a 0W-40 or 5W-40. 5W or 15W-50 makes perfect sense to me. Especially considering that a motor oil with low ash content, though it preserves our CATs and significantly lowers the coking and varnishing effects of GDI, will sacrifice the additive profile that reduces wear. At 250+ oil temp, 50W is about as thick as water, I want all of the viscosity and wear protection that I can get.

I will change out more frequently with a low ash Dexos 2. Understanding that with a low ash profile, my intake valves and blower bricks are better protected from the goop introduced by the PCV. However, the compromise is that my wear protection profile is reduced because those same high ash components are what protects my internal components from wear.

The question however, remains somewhat unanswered; Is M1 ESP 0W-40, now a recommended fill for pre 2019 Gen 6 LT1/4?

With motors that run on the street with oil temps at 210+, I truly hope so. IMHO, at the oil temps that an LT4 operate, 5W-30 lacks the viscosity to protect our powerplants long term.

I personally will run 0W or 5W-40 Dexos 2 on the street. I will always run at least a 5W or 15W-50 under heavy load/track conditions.

Do your research gentlemen/ladies; there is a significant difference between 100% synthetic and full synthetic. SIGNIFICANT!
Agreed - good post.

Can I ask why you wouldn't run a catch can? This will alleviate your PCV concerns and I suggest all GM DI engines should have some sort of catch can setup to maintain intake tract and valve cleanliness (I run a Mighty Mouse on my Denali 6.2).
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Old 08-08-2018, 02:40 PM   #17
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Agreed - good post.

Can I ask why you wouldn't run a catch can? This will alleviate your PCV concerns and I suggest all GM DI engines should have some sort of catch can setup to maintain intake tract and valve cleanliness (I run a Mighty Mouse on my Denali 6.2).
It is my belief that a CC (that does not defeat the PCV and remains within warranty guidelines) is one of the best long term investments that we can make in our GDI/FI LT4s.

I honestly believe that the only reason that CCs are not OEM is the fact that if someone neglects to dump their CC, all that goop in the can will be ingested into the top end and that could prove to be catastrophic. It's possible that the legal team does not like the potential for liability.

Sorry OP for drifting off topic.
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Old 08-08-2018, 02:42 PM   #18
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It is my belief that a CC (that does not defeat the PCV and remains within warranty guidelines) is one of the best long term investments that we can make in our GDI/FI LT4s.

I honestly believe that the only reason that CCs are not OEM is the fact that if someone neglects to dump their CC, all that goop in the can will be ingested into the top end and that could prove to be catastrophic. It's possible that the legal team does not like the potential for liability.

Sorry OP for drifting off topic.
Freezing weather is another reason.
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Old 08-08-2018, 02:47 PM   #19
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Originally Posted by waterman View Post
It is my belief that a CC (that does not defeat the PCV and remains within warranty guidelines) is one of the best long term investments that we can make in our GDI/FI LT4s.

I honestly believe that the only reason that CCs are not OEM is the fact that if someone neglects to dump their CC, all that goop in the can will be ingested into the top end and that could prove to be catastrophic. It's possible that the legal team does not like the potential for liability.

Sorry OP for drifting off topic.
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Freezing weather is another reason.
I run a CC on my truck in Canada (-35 C) without issue, but it does get to sit in the heated garage most of the time.

Sorry as well for the derail, good oil info in this thread, just thought the CC was a good topic to add to the ash issue brought up. Thanks for the replies
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Old 08-16-2018, 03:57 PM   #20
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Does this apply to CANADAIAN cars, because according to my dealer it doesn’t and I won’t be coevered under warranty if I switch oils and have an issue.
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Old 08-16-2018, 04:10 PM   #21
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im currently using a 5w40 in my car but i dont drive it much so i just leave it in lol not going to switch to track oil and then switch back to street oil lol thats dumb
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Old 08-16-2018, 04:14 PM   #22
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Does this apply to CANADAIAN cars, because according to my dealer it doesn’t and I won’t be coevered under warranty if I switch oils and have an issue.
Switch oils to the GM recently changed recommendation? How on earth can a dealer say you wouldn't have warranty?

Sounds like a lazy service department who doesn't want to have to look up any information or bring in oil they might not yet carry...
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Old 08-16-2018, 06:49 PM   #23
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Does this apply to CANADAIAN cars, because according to my dealer it doesn’t and I won’t be coevered under warranty if I switch oils and have an issue.


I wouldn't over think this one too much. This thread is a pretty good resource coming from the top.
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Old 08-27-2018, 04:33 AM   #24
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What’s the big deal about dexos?
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Old 08-27-2018, 05:03 AM   #25
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What’s the big deal about dexos?
Short answer: If you own a 2011 or newer GM vehicle, you must use a motor oil that meets GM’s dexos specifications to maintain that vehicle’s warranty.

From what I understand, Dexos 2 greatly reduces the byproducts of GDI/PCV especially when associated with forced induction. Notably, coking of intake valves and guides, as well as varnishing intake ports and charge air coolers (blower bricks). Dexos 2 also protects the guts of your cats from premature clogging and wear.

My $0.02. For what it's worth.
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Old 08-27-2018, 09:41 AM   #26
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What’s the big deal about dexos?
The stamp simply means the oil company paid GM to have it on their bottle. Yes, there are some standards that must be met......but there are tons of great oils that would meet the standards, but haven’t paid for the stamp.

It’s either a BS scam, or brilliant money making and marketing idea. You decide.
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Old 08-28-2018, 08:39 PM   #27
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im currently using a 5w40 in my car but i dont drive it much so i just leave it in lol not going to switch to track oil and then switch back to street oil lol thats dumb
Yeah.
I have a supply of Valvoline 5w40 ready for my next couple oil changes, yet the 5w40 part of the question was omitted.
Guess it's fine since it's Dexos 2.
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Old 08-28-2018, 09:13 PM   #28
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Dexos 2 5w40 is fine to use all the time.

Edit. The fill cap on a 2019 Z06 Vette says 0W40. Saw it in person.
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