Recall = M1 0w-40

[rdezs]

GM is notorious for changing things in the middle of a model year...

 

[Charlie207]

GM is notorious for changing things in the middle of a model year...

But that's not the case here.

 

[opfor2]

Now I just wish they would do a recall on their stupid AFM/DOD crap

 

[j91z28d1]

I still need someone to explain to me how checking for a code about crank/cam mismatch signal shows if your engine will rod knock and lock up.

is there an issue with the vvt setup causing oil pressure issues to the rods?

I'm baffled

 

[rdezs]

You can replace the camshaft sensor and or the crankshaft sensor in the engine should still start. You do a relearn so the ECM has the exact positions for them. If the camshaft sensor doesn't drive with the crankshaft sensor, usually it will fail to start on the first turn of the key, but on the second attempt it will usually start right up.
Never heard of an issue with the VVT affecting oil pressure to the rods. The VVT is typically very reliable.
Nothing about it would make the engine lock up. Only getting the initial timing off would do that.

 

[j91z28d1]

You can replace the camshaft sensor and or the crankshaft sensor in the engine should still start. You do a relearn so the ECM has the exact positions for them. If the camshaft sensor doesn't drive with the crankshaft sensor, usually it will fail to start on the first turn of the key, but on the second attempt it will usually start right up.
Never heard of an issue with the VVT affecting oil pressure to the rods. The VVT is typically very reliable.
Nothing about it would make the engine lock up. Only getting the initial timing off would do that.

then why is gm using a mismatch signal to deicide if an engine gets replaced on not? and the failure of these engines if I'm seeing it right is the bottom ends locks up. gm is saying connecting rod manufacturing fault but to check for cam code, not inspect the rods.

as for vvt I have read a few different places that vvt uses more oil volume to operate than afm does. my only thought was it's the only thing that can change the signal timing between cam and crank sensor, short of a bad sensor, but these are brand new low mileage engines. and there's no talk of replacing sensors or running a case learn. if code is present, you get a new engine. if code isn't you get thicker oil.

I guess it's possible gm has screwed up this whole recall and will end up putting new engines in tkem all. but weird.

 

[rdezs]

The VVT is limited on how far it can move the cam.... I think there's more going on here than they are admitting to as of yet.

 

[donjetman]

They'll probably REVISE the recall 10 times before we hear the end of it, like they do their TSBs. Like TSB# 10-06-01-008 "M"

 

[Just Fishing]

My wrangler calls of 20w oil, newer ones still do as well.

The 3.8 in my jeep is known for spinning rod bearings.
And guess what i bought it with?
A spun bearing!

Seems like most loose it at about 200-230k.
Not that bad, but still.

I don't trust 20w oil, especially with my tahoe experience and thrust bearings.

That wasn't the oils fault, it was a combo of machine shop doing a shit job, aftermarket comverter, and me adding a couple percent to the converter lockup pressure.

Issues fixed with a brand new crank, and i lowered the converter lockup pressures under what it was stock.

I'm still running 15w40, i had the best results running that while the crankshaft kept trying to escape from the front of the engine.

 

[Boatguy]

So what about us with L86 6.2s? I just use my Yukon for road trips (usually to the snow) and towing a 5K boat. I always change my oil at 3K.

 

[rdezs]

I would be running a 5W-40 for towing definitely. Nothing wrong with a 10w40 synthetic for the heat of Summer.

 

[donjetman]

LSjr video on the subject:

 

[j91z28d1]

LSjr video on the subject:

interesting, but I think you've already shown 0w20 in your 07 ls without any extra wear.

I mean I guess these di engines have higher compression and the newer tranny tuning seems to lug them down keeping rpms low for mpg, but I'm still I bit iffy on how a crank sensor and cam sensor can show rod bearing slop that you can't hear. especially when the fault code routine wouldn't be coded with this failure in mind. you'd think it was looking for bad sensors, or a vvt solenoid failure.

if a simple oil change was the fix, they sure got a lot of bad press and pissed off people over not just doing this 3 years ago.

that super car 0w40 isn't cheap either. I was going to run it in my ls3 car and decided to go cheaper and probably amsoil. it's s
also ot that easy to find in 5qt jugs. your oil change just became almost 200$ diy.

 

[Marky Dissod]

I'm still a bit iffy on how a crank sensor and cam sensor can show rod bearing slop that you can't hear,
especially when the fault code routine wouldn't be coded with this failure in mind.
you'd think it was looking for bad sensors, or a vvt solenoid failure.

Never understood how VCRs worked, and INITIALLY couldn't tell between SP & EP,
but a few years later, the Short Play recordings have outlasted the Extended Play recordings.
(Actually the only VCR tapes I've left are SPs, the rest busted.)

In other words the differences were initially too small for a human to tell,
but they were there, detectable, with sensitive enough equipment.

Crank & Cam Position sensors are capable of detecting an 'unexpected' difference of 1°.
It's ok if you can't hear it.

Having said the above ...
It's entirely possible that a person who drives very gently and switches to 0W40
may never throw this code, even if their L87 was built (with) subpar (parts),
but that L87 may still only barely make it past 150,000 miles,
when it should've made it past 250,000, except for GM pinching pennies again.

Note that GM is NOT, for example, accepting used motor oil analyses.
Even by saying 'P0016 means this engine needs replacing',
they're STILL trying to get away with as much as possible.

Maybe y'all should start by TRYING to make your engine throw this code, sooner rather than later?

 

[Noggles]

On a different forum I'm on (not car related) guys have been talking about the newer gen 5 truck engine failures for the last couple of years. Most of them were saying the engines were locking up so it made me wonder if the issue was oil pump related. I know the early LT4 engines had a recall for the oil pump gears cracking and breaking and causing no oil pressure. I would assume like our trucks this would cause a notification on the dash but I was wondering if these new issues were oil pump related. Seems weird that they are chasing VVT stuff either way.

 

[OR VietVet]

 

[opfor2]

So, I'm wondering if 0w-40 is now good for the 6.2l's then wouldn't 5w40 be good for the 5.3l?

 

[Marky Dissod]

So, I'm wondering if 0W40 is now good for the 6.2L, then wouldn't 5W40 be good for the 5.3L?

Any motor oil good enough for an L8T or an LT1 is good enough for any other GM V8.
0W40 has been spec for the LT1 for several years.
5W30 has been spec for the L8T for several years.

 

[Scrappycrow]

A great video on this put out yesterday by Engineering Explained. If you don't want to watch the whole thing, watch from ~8:45 to ~11:30.

 

[Marky Dissod]

A great video on this put out yesterday by Engineering Explained.
If you don't want to watch the whole thing, watch from ~8:45 to ~11:30.

And yet there will still be people insisting that,
since they have not yet received GM's permission / /blessing to use 0W40,
they will continue using 0W20, in fear of losing their warranty from the company that betrayed them.