I got a letter from GM yesterday in regard to my wife's 09 Acadia. It seems that there has been premature timing chain wear in some vehicles that is related to extended oil change intervals. Owners can take their vehicles in to have the computer/Oil change interval indicator reset which will result in shorter OCI's. I have been changing every 5k whereas it appears that the OCI indicator would have it go out to about 11k. My concern was the Direct Injection.
Acadia Recall/OCI
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I understand that any timing chain repair is covered under some sort of extended warranty. I didn't know that GM is now also reducing the recommended OCIs via the OLM. Interesting. Thanks for posting.
Originally Posted By: Hokiefyd
I understand that any timing chain repair is covered under some sort of extended warranty. I didn't know that GM is now also reducing the recommended OCIs via the OLM. Interesting. Thanks for posting.
doesn't sound right that the two are related. I thought that the timing chain problem is related to stretching and worn out oil would not cause that and/or just one part to fail.
Sounds like GM is having second thoughts on the OCI in DI engines.
I understand that any timing chain repair is covered under some sort of extended warranty. I didn't know that GM is now also reducing the recommended OCIs via the OLM. Interesting. Thanks for posting.
doesn't sound right that the two are related. I thought that the timing chain problem is related to stretching and worn out oil would not cause that and/or just one part to fail.
Sounds like GM is having second thoughts on the OCI in DI engines.
Originally Posted By: Old Mustang Guy
I got a letter from GM yesterday in regard to my wife's 09 Acadia. It seems that there has been premature timing chain wear in some vehicles that is related to extended oil change intervals.
See here for more information:
https://bobistheoilguy.com/forums/posts/2200542/
I got a letter from GM yesterday in regard to my wife's 09 Acadia. It seems that there has been premature timing chain wear in some vehicles that is related to extended oil change intervals.
See here for more information:
https://bobistheoilguy.com/forums/posts/2200542/
Oops
Consumer product testing yields another failure that automaker R&D, the gazillions of dollars and hours of manpower, missed again.
Just pay dearly for this new vehicle and we, the automaker, will promote you to the lofty title of "unpaid test guinea pig".
Consumer product testing yields another failure that automaker R&D, the gazillions of dollars and hours of manpower, missed again.
Just pay dearly for this new vehicle and we, the automaker, will promote you to the lofty title of "unpaid test guinea pig".
I don't have a problem with it. At least they are taking action on the issue. Some other automakers just deny responsibility. We at BITOG already knew that 11k on regular oil was a stretch, especially on this motor. Most dealers were already recommending shorter intervals to their customers. I've done syn at 5k.
Originally Posted By: Old Mustang Guy
I got a letter from GM yesterday in regard to my wife's 09 Acadia. It seems that there has been premature timing chain wear in some vehicles that is related to extended oil change intervals. Owners can take their vehicles in to have the computer/Oil change interval indicator reset which will result in shorter OCI's. I have been changing every 5k whereas it appears that the OCI indicator would have it go out to about 11k. My concern was the Direct Injection.
My brother just had his done on the Cadillac CTS. Same indciation and issue so perhaps all GM car will be realled and the same modification ill be performed.
Durango
I got a letter from GM yesterday in regard to my wife's 09 Acadia. It seems that there has been premature timing chain wear in some vehicles that is related to extended oil change intervals. Owners can take their vehicles in to have the computer/Oil change interval indicator reset which will result in shorter OCI's. I have been changing every 5k whereas it appears that the OCI indicator would have it go out to about 11k. My concern was the Direct Injection.
My brother just had his done on the Cadillac CTS. Same indciation and issue so perhaps all GM car will be realled and the same modification ill be performed.
Durango
This has more to do with the direct injection. The OLM recalabration covers, among others, the 2007 GMC Acadia with did NOT have DI.
I find it interesting that we skip the 2008 model years.
FYI, I just had the timing chains replaced on my 07 non-DI Acadia using more frequent than OLM oil changes. I did pull a sample before taking it in and I am awaiting the used oil analysis results from Blackstone. I will post them when I get them back.
I find it interesting that we skip the 2008 model years.
FYI, I just had the timing chains replaced on my 07 non-DI Acadia using more frequent than OLM oil changes. I did pull a sample before taking it in and I am awaiting the used oil analysis results from Blackstone. I will post them when I get them back.
Originally Posted By: Burt
Originally Posted By: Hokiefyd
I understand that any timing chain repair is covered under some sort of extended warranty. I didn't know that GM is now also reducing the recommended OCIs via the OLM. Interesting. Thanks for posting.
doesn't sound right that the two are related. I thought that the timing chain problem is related to stretching and worn out oil would not cause that and/or just one part to fail.
Sounds like GM is having second thoughts on the OCI in DI engines.
AFAIK timing chain stretch is mostly wear, if a 50 link chain had .001 wear at each pivot point you'd have a .050 longer chain... Not a big deal on a engine with a tensioner(still the valve timing will be retarded), but on a conventional cam in block setup, would be quite noticeable...
Originally Posted By: Hokiefyd
I understand that any timing chain repair is covered under some sort of extended warranty. I didn't know that GM is now also reducing the recommended OCIs via the OLM. Interesting. Thanks for posting.
doesn't sound right that the two are related. I thought that the timing chain problem is related to stretching and worn out oil would not cause that and/or just one part to fail.
Sounds like GM is having second thoughts on the OCI in DI engines.
AFAIK timing chain stretch is mostly wear, if a 50 link chain had .001 wear at each pivot point you'd have a .050 longer chain... Not a big deal on a engine with a tensioner(still the valve timing will be retarded), but on a conventional cam in block setup, would be quite noticeable...
GM really messed up the timing chain oiler nozzles in the early Ecotec engines (through early MY '03). The early nozzles did not oil properly at low speed and were very prone to clogging up causing the chains to be oiled poorly if at all. A broken chain meant a new engine in most cases.
At least GM is acknowledging the problem here. But with the Ecotecs only 20k mid MY '01 Saturn L series sedans were recalled and to this day there is no TSB, no extended warranty or no recall on any other early Ecotec car (GM did the corporate roll out in MY '02).
At least GM is acknowledging the problem here. But with the Ecotecs only 20k mid MY '01 Saturn L series sedans were recalled and to this day there is no TSB, no extended warranty or no recall on any other early Ecotec car (GM did the corporate roll out in MY '02).
Hyundai has Loud start up noise coming from the chain area on a lot of the 3.5 v6 starting in 2010 and they say it is normal (its Not)
we have done a bunch of them in my shop
Originally Posted By: Burt
doesn't sound right that the two are related. I thought that the timing chain problem is related to stretching and worn out oil would not cause that and/or just one part to fail.
Sounds like GM is having second thoughts on the OCI in DI engines.
I think we have two issues here. One is a problem with the the timing chains, the other is the OLM needs to be reprogrammed and the OCI shortened in all GM DI engines. I think we will soon be seeing all kinds of oil related problems with these engines, and those doing extended drains look out. At least the members here have a heads up, imagine all those people who don't have the interest in vehicles like we do?
doesn't sound right that the two are related. I thought that the timing chain problem is related to stretching and worn out oil would not cause that and/or just one part to fail.
Sounds like GM is having second thoughts on the OCI in DI engines.
I think we have two issues here. One is a problem with the the timing chains, the other is the OLM needs to be reprogrammed and the OCI shortened in all GM DI engines. I think we will soon be seeing all kinds of oil related problems with these engines, and those doing extended drains look out. At least the members here have a heads up, imagine all those people who don't have the interest in vehicles like we do?
My dad's 08 CTS Di had the recall letter to him also with the oci montior. I wonder if the same problem with the fuel injection exsist my wife chevy malibu with 3.6 high feature motor
Where are the guys that suggest that the manual and/or the engineers are all knowing? Doesn't the manufacturer always know best? Well eventually they do...
Originally Posted By: Ram01
My dad's 08 CTS Di had the recall letter to him also with the oci montior. I wonder if the same problem with the fuel injection exsist my wife chevy malibu with 3.6 high feature motor
Ram01,
I guess you and I will see later on.... I have an 08' Inpala SS with the 5.3 liter engine that my OLM tells me to change the oil every 6K but the dealership wants me to bring it in every 3K instead. I'm wondering if they want every 3K then why do they bother with a electronic monitor??? It's suppose to be a solution to the oil shortage I say why not but there's always something/somebody trying to get into our wallets. How GM came up with this solution and for all appearances it works well based on one's driving habits but now that this has happened it makes me feel it's only just a fancy gimmick. GM is making themselves look like fools in my eyes now. I'm still using my OLM until it tells me to change my oil. If every three is a must then why do we bother with synthetic oil?
Durango
My dad's 08 CTS Di had the recall letter to him also with the oci montior. I wonder if the same problem with the fuel injection exsist my wife chevy malibu with 3.6 high feature motor
Ram01,
I guess you and I will see later on.... I have an 08' Inpala SS with the 5.3 liter engine that my OLM tells me to change the oil every 6K but the dealership wants me to bring it in every 3K instead. I'm wondering if they want every 3K then why do they bother with a electronic monitor??? It's suppose to be a solution to the oil shortage I say why not but there's always something/somebody trying to get into our wallets. How GM came up with this solution and for all appearances it works well based on one's driving habits but now that this has happened it makes me feel it's only just a fancy gimmick. GM is making themselves look like fools in my eyes now. I'm still using my OLM until it tells me to change my oil. If every three is a must then why do we bother with synthetic oil?
Durango
DI seems to be the cause of some problems. The V-8's from GM are not DI, so it's less of a problem.
The V-8's, at least some of them, are variable valve timing, which seems to work best with shorter OCI's then before.
Perhaps that's the sticking point, the VVI system.
The early problems with the V-6 engines was the VVI system, which may not be solved yet.
Add the DI, and the issues get worse.
The V-8's, at least some of them, are variable valve timing, which seems to work best with shorter OCI's then before.
Perhaps that's the sticking point, the VVI system.
The early problems with the V-6 engines was the VVI system, which may not be solved yet.
Add the DI, and the issues get worse.
Originally Posted By: dwendt44
The V-8's, at least some of them, are variable valve timing, which seems to work best with shorter OCI's then before.Perhaps that's the sticking point, the VVI system.
I am not aware of a GM V8 with any variable valve timing. I thought they had cylinder deactivation only.
Can anyone illuminate me?
The V-8's, at least some of them, are variable valve timing, which seems to work best with shorter OCI's then before.Perhaps that's the sticking point, the VVI system.
I am not aware of a GM V8 with any variable valve timing. I thought they had cylinder deactivation only.
Can anyone illuminate me?
http://media.gm.com/content/media/us/en/...ago/0210_vortec
5th paragraph refers to variable valve timing.
5th paragraph refers to variable valve timing.
The specifications for the 5.3 V-8 on the current 1500 trucks claims VVT.
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