GM aborting move to 0w-40

[Greenbeforeblue]

When I was in the fleet business we had a couple of Chevy 4.3s that snapped the starters off the block. The fix was a new block. If I remember correctly, it was due to a faulty cam position sensor when it got hot. The motor would try to fire when it shouldn't have (confused by the faulty CPS) and cause a kick back while the starter was engaged, snapping the starter and mounting ears off the block. Someone said way back when, but it was never verified to my satisfaction, that block casting was made lighter and there wasn't enough material where the starter mounted.

 

[burbguy82]

Yea, these guys are just piling on. The GMT400 and GMT 800s are the only trucks that are still from their eras on the road in any real numbers.

100% i recently sold a gmt400 sub for 12.5K

 

[burbguy82]

Yeah, and my 4.3 cast iron six cylinder with a 4L60E is still running w/o a single problem after 13 years since I bought it new.

the "later" 4.3s are beasts

 

[ka9mnx]

As I said earlier in this post, this is a lower rod bearing failure. Although I'm not a xw-20 fanboy. this is a very rare issue HTHS will not fix.

 

[Snagglefoot]

The 6.2 L-87 makes 460 lb ft of torque. It just doesn’t seem to be the engine to run a 0w20 motor oil. My 6.0 LY-6 makes 383 lb ft of torque and spec’d 5w30. I have been running 5w40 in it for last few years. The 6.6 L8T specs 5w30. It’s crazy that GM is digging in it’s heals for 0W20.

 

[Patman]

The 6.2 L-87 makes 460 lb ft of torque. It just doesn’t seem to be the engine to run a 0w20 motor oil. My 6.0 LY-6 makes 383 lb ft of torque and spec’d 5w30. I have been running 5w40 in it for last few years.

There’s no way I would run 0w20 in the 6.2L LT1 in my Corvette (which makes 455hp/460 lb ft) I wasn’t even comfortable running vanilla M1 5w30 with its weaker 3.1 HTHS, which is why I chose ESP Formula 5w30 right away, I think these engines need a 3.5+ HTHS oil.

 

[ARCOgraphite]

Some random issue seen when rebuilding are: excessive or inadequate bearing crush, inadequate big end side clearance, excessive fillet or rounds at journal margin (also missing bearing chamfer), positive deck + thin gasket, Stuck IE valve(s), excessive cam advance or retard vs blueprint, incorrect pump bypass spring, leaking or missing gallery plug(s), piston/pin offset 180 out, and again, machining/polishing debris in crank or block galleries causing oil starvation or bearing streak.
have any teardowns evidenced bent valves? Arco.

 

[OVERKILL]

The 6.2 L-87 makes 460 lb ft of torque. It just doesn’t seem to be the engine to run a 0w20 motor oil. My 6.0 LY-6 makes 383 lb ft of torque and spec’d 5w30. I have been running 5w40 in it for last few years. The 6.6 L8T specs 5w30. It’s crazy that GM is digging in it’s heals for 0W20.

I mean, the 5.7L HEMI makes 410lb-ft of torque and it doesn't seem to have any issues on an xW-20

 

[Pablo]

It's Tuesday, and yeah I am nursing a midsection blow out, but is there an official GM link on this?

 

[ET16]

Yeah, I've been sitting on a recall for my 2017 Traverse. I intend to FINALLY have it addressed when I bring it in for a transmission flush.
Its unbelievable that in 2017 this was still an issue
View attachment 278889

Kind of weird writing in that first paragraph.

 

[alarmguy]

Kind of weird writing in that first paragraph.

I’m not understanding what is weird
Maybe the word “finally”?

The reason for that would be I initially got a letter from GM indicating there would be a recall however, the parts are not in stock yet, and they will notify me when they are.
Once I got that letter, I admit it’s been sitting on my desk for months now however I’ve been under medical treatments, almost daily, and now that things are settling down, I plan on getting to it

 

[Bud_One]

???

 

[edyvw]

View attachment 279078

I know what MAN is, but it ain't a Swedish company.

 

[RDY4WAR]

The lube report released today stated that 570,000 additional gallons of 0W-40 was made in response to that GM memo.

 

[Pablo]

The lube report released today stated that 570,000 additional gallons of 0W-40 was made in response to that GM memo.

So now they dump it out?

 

[ammolab]

So now they dump it out?

Rebate, sale or closeout. Maybe all three!

 

[jtwrace]

Rebate, sale or closeout. Maybe all three!

I'll take some. I rip through the stuff since it has become my go to oil for everything.

 

[jtwrace]

Incoming QC sampling plan should catch that. I don't know but guessing ISO/TS IATF 16948 + 9001 QMS is pretty robust.

As my old boss used to say, "ISO 9001 just ensures it's consistently done improperly"

 

[ARCOgraphite]

As my old boss used to say, "ISO 9001 just ensures it's consistently done improperly"

So you had ineffective manufacturing engineering and a boss who would not drive improvement. It can take an effort and discipline to get and then do things right. I might ask does the modern world really care anymore?

 

[Brian123]

https://www.amsoil.com/p/amsoil-signature-series-0w-20-100-synthetic-motor-oil-asm/

I am just wondering if all of these GM Vehicles had been using the oil I Linked, if there would have been any issues? I do not know what the OCI's were on these vehicles or if the owners checked their oil level. I am willing to bet that even if these owners were using Redline 0W-20, the good stuff, not the cheap stuff, we might not be seeing these issues.