confusion on 2.4 engine issues - TerrainForum.net: GMC Terrain Forum
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post #1 of 20 (permalink) Old 08-07-2019, 12:44 PM Thread Starter
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confusion on 2.4 engine issues

it's hard to find the answer to this but what year did the issue with the rear main seal blowing out on the 2.4 engine get resolved? Also, what was done to resolve this from happening?

How about the issue with the oil consumption. Do all 2.4 engines have this issue or is there year when a fix was implemented?

thanks in advance.
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post #2 of 20 (permalink) Old 08-07-2019, 01:13 PM
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GM says that the Oil Consumption problem was fixed in May of 2013 with the introduction of the "525 Rings" (new and improved Piston Rings) to the production lines. This is why, with the active Class Action Lawsuit (scheduled to be "Finalized" this October - unless there are Objections or Continuances), 2013's are only included in the lawsuit coverage up to the May 2013 build-date timeframe.

As for the rear main seal issue, I'm not up on that one - other than to say there's been plenty of discussion on this forum about it. You can use the SEARCH function for find and read all the posts. I think people (in cold weather climates) have been installing vented oil filler caps, and GM has a part number for one they recommend using. Some may also be slightly modifying the PCV (drilling larger holes?) to mitigate the problem somewhat.

But search the forum and read the posts for the details...

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post #3 of 20 (permalink) Old 08-14-2019, 12:42 PM Thread Starter
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Has anyone with a 2016 2.4 engine had the rear main seal blow out?
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post #4 of 20 (permalink) Old 08-20-2019, 12:51 PM Thread Starter
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has anyone with a 2015 2.4 engine had the rear main seal blow out?
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post #5 of 20 (permalink) Old 08-20-2019, 02:35 PM
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Originally Posted by tm16 View Post
has anyone with a 2015 2.4 engine had the rear main seal blow out?
The problem on ANY 2.4L (2010 to 2017) engine regarding a blown crank shaft main seal has not been resolved since, to our knowledge, the PCV path and PCV cylinder head port has not been changed in design.
Therefore, if you live and drive in a location that annually has outside air temperatures dip to single digits or below, it might be a good idea to install a GM pressure relief vented Oil Filler cap as has been listed and discussed in this forum.

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post #6 of 20 (permalink) Old 09-02-2019, 08:22 PM
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I too, am curious. Does anybody know when the oil consumption issues were truly resolved, if ever? Looking at reviews, complaints seem to die down a lot by the 2016 model year. I saw someones post about new rings some time in 2013, however I still read of complaints up to 2015 (with oil consumption).
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post #7 of 20 (permalink) Old 09-02-2019, 09:13 PM
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Originally Posted by gregk24 View Post
I too, am curious. Does anybody know when the oil consumption issues were truly resolved, if ever? Looking at reviews, complaints seem to die down a lot by the 2016 model year. I saw someones post about new rings some time in 2013, however I still read of complaints up to 2015 (with oil consumption).
The oil consumption issue was addressed but not necessarily "resolved" after 2014 with the design of new piston coating and ring design. That said , we have seen one or more 2014 owners here cite oil consumption in there 2014 engines as I recall.
Was it because of design failure or lack of owner proper maintenance (oil and filter changes, correct oil as per GM spec, etc)?


Again. . there was no TSB (Service Bulletins) and no documented design changes regarding the 2.4L PCV issues that have the potential to cause a main seal blow out.
Not seeing any 2016 or 2017 2.4L main seal blow outs is no proof they can or won't occur.
There were no 2013, 2014, or 2015 main seal issues initially until the last 2 years or so when some owner posted here. Simply because it took a couple years for the PCV orifices became partially or fully clogged with deposits and/or frozen with moisture build up in the crank case.

The potential for 2.4L PCV orifice clogging or freezing still is present in any and all 2010 to 2017 2.4L GM engines. And there still seems to be a potential for oil consumption at least from the one or two 2014 owners that have experienced it and reported it here.

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Last edited by JayTee2014; 09-02-2019 at 09:22 PM.
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post #8 of 20 (permalink) Old 09-02-2019, 10:29 PM
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Quote:
Originally Posted by JayTee2014 View Post
The oil consumption issue was addressed but not necessarily "resolved" after 2014 with the design of new piston coating and ring design. That said , we have seen one or more 2014 owners here cite oil consumption in there 2014 engines as I recall.
Was it because of design failure or lack of owner proper maintenance (oil and filter changes, correct oil as per GM spec, etc)?


Again. . there was no TSB (Service Bulletins) and no documented design changes regarding the 2.4L PCV issues that have the potential to cause a main seal blow out.
Not seeing any 2016 or 2017 2.4L main seal blow outs is no proof they can or won't occur.
There were no 2013, 2014, or 2015 main seal issues initially until the last 2 years or so when some owner posted here. Simply because it took a couple years for the PCV orifices became partially or fully clogged with deposits and/or frozen with moisture build up in the crank case.

The potential for 2.4L PCV orifice clogging or freezing still is present in any and all 2010 to 2017 2.4L GM engines. And there still seems to be a potential for oil consumption at least from the one or two 2014 owners that have experienced it and reported it here.
Was there another ring re-design IN 2014? (not the 2013.5 redesign). Trying to learn about these, my parents just purchased a 2017 Terrain with the 2.4. Just went on an 800 mile road trip, no notable consumption.
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post #9 of 20 (permalink) Old 09-03-2019, 06:26 AM
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Originally Posted by gregk24 View Post
Was there another ring re-design IN 2014? (not the 2013.5 redesign). Trying to learn about these, my parents just purchased a 2017 Terrain with the 2.4. Just went on an 800 mile road trip, no notable consumption.

The 2.4L used in the '17 should be, for the most part, bulletproof. Rest easily.
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post #10 of 20 (permalink) Old 09-03-2019, 07:50 AM
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Originally Posted by gregk24 View Post
Was there another ring re-design IN 2014? (not the 2013.5 redesign). Trying to learn about these, my parents just purchased a 2017 Terrain with the 2.4. Just went on an 800 mile road trip, no notable consumption.


It was the "2013.5 " change in pistons and rings. I just rounded to 2014 since then most people will have no doubt reading this that at least the 2014 has the redesign.


As RIT33 says. . don't over think it. Just change oil and filter to a GM Dexos II certified oil at about every 5,000 miles and all should be well. Of more concern is the PCV orifice if parents live where winter temps would get down to single digits or lower. If they live and drive in warmer climates. . should be no worries there either.
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Last edited by JayTee2014; 09-03-2019 at 07:53 AM.
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