GM aborting move to 0w-40

chris719 said:
I'm confused, do you mean in general or for this GM engine? They moved to a 40 because they need the higher HTHS a 30 would not provide.
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For GM. That’s just dumb on their part. If EPA bucks is what they were after out the gate with a 0w20 they should have left room that a 30 grade would be more than enough lubricity. I see it all the time posted here Toyota runs 0w16 but across the globe they’re saying the engine will take a 15w40 like chocolate sauce on a Sunday.
 
tcp71 said:
Plenty of High HTHS (over 3.5) 0w30s exist. Anything with a porsche C30 spec.
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What are you arguing? The Euro 30s are pretty much exactly 3.5 and lower than the 40s which are 3.6-3.8. There are not many, in fact there are very few >=3.5 HTHS 0W-30 readily available on the market, and none of them have any GM approvals or are stocked by GM dealers. They will also go under that 3.5 almost immediately. If GM thought they could use a 30 they would have just used a 30 because the 40 is even more of a slight hit to fuel economy. Arguing that GM should have gone to a 0W-30 instead of a 0W-40 is pointless.
 
chris719 said:
What are you arguing? The Euro 30s are pretty much exactly 3.5 and lower than the 40s which are 3.6-3.8. There are not many, in fact there are very few >=3.5 HTHS 0W-30 readily available on the market, and none of them have any GM approvals or are stocked by GM dealers. They will also go under that 3.5 almost immediately. If GM thought they could use a 30 they would have just used a 30 because the 40 is even more of a slight hit to fuel economy. Arguing that GM should have gone to a 0W-30 instead of a 0W-40 is pointless.
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Who's arguing? Providing information. Getting a 0w30 above 3.5 HTHS isn't a problem and are readily available. They could meet GM Dexos standards in a heartbeat...just like the mobil 0w40s did overnight.
 
chris719 said:
What are you arguing? The Euro 30s are pretty much exactly 3.5 and lower than the 40s which are 3.6-3.8. There are not many, in fact there are very few >=3.5 HTHS 0W-30 readily available on the market, and none of them have any GM approvals or are stocked by GM dealers. They will also go under that 3.5 almost immediately. If GM thought they could use a 30 they would have just used a 30 because the 40 is even more of a slight hit to fuel economy. Arguing that GM should have gone to a 0W-30 instead of a 0W-40 is pointless.
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M1 0W-30AFE is dexos approved and available at Walmart.
 
Here's how I see it. The fact that the "engineers/engine designers" even considered bumping up the viscosity as a Hail Mary play tells me there is something to "thicker oils" offering some added protection or benefits. Having said that, defective parts or a poor a design is just that, and repair or replacement is the only real fix.
 
Pablo said:
Honestly some of these engines, I would never in my lifetime be able to tear into them, bolt by bolt. Finding carnage is just like extra frosting.
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Same also. Satisfies my curiosity of how some engines are put together. Not a channel for best maintenance practices though as he goes all Gorilla in his tear downs.
 
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