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Grumpy Bear

Sugar Bears 2015 GMC Terrain SLE-2 2.4 AWD

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12 hours ago, Doublebase said:

I know you’re not going to listen to me,

Wow Mike I'm hurt. :tear: It's the bat crap crazy people I don't listen to. :rolleyes: You're not even mildly obnoxious. :lol:

 

We've made such good progress with this motor that a replacement is not currently on the table. A few ounces between 2500 mile OCI's verses a quart per tankful is major progress. Almost perfect. Besides, it's still teaching me things that will be useful  in her Verano. Same motor with but 14K on the clock and living on AMSOIL SS. Sort of a Guinea Pig.

 

I don't consider it a failed experiment. It would be a failure if I failed to learn from it and learn I have.

 

Don't trust mineral oil based Group III or III+ Full Synthetics in motors with low tension oil rings to go 5K OCI intervals and expect the rings not to collapse. Not even if the UOA shows you have 50% acid package left. I expect that would also be true of motors with 200 F + water thermostats or turbo motors. 

 

In a recent thread I was following a fella with a pre 2014 5.3 with collapsed rings just did the full TSB, deflector, valve cover etc. then did the same GM upper cylinder soak we did and his quit using oil as well. Those motors also have low tension oil rings. So that is two that have recovered collapsed ring sets at or near 100K miles in service. I believe he was a Mobil 1 guy. We used QSUD. Both Group III Full Synthetics. 

 

No new motor and no trades on the horizon. Thanks for dropping in!! 

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11 hours ago, Grumpy Bear said:

Wow Mike I'm hurt. :tear: It's the bat crap crazy people I don't listen to. :rolleyes: You're not even mildly obnoxious. :lol:

 

We've made such good progress with this motor that a replacement is not currently on the table. A few ounces between 2500 mile OCI's verses a quart per tankful is major progress. Almost perfect. Besides, it's still teaching me things that will be useful  in her Verano. Same motor with but 14K on the clock and living on AMSOIL SS. Sort of a Guinea Pig.

 

 

 

No new motor and no trades on the horizon. Thanks for dropping in!! 

That's great because I enjoy reading your build threads - as I enjoy vehicle longevity and maintenance. 

 

Low tension rings are certainly a problem nowadays, mostly with poor oil quality and neglect. And with manufacturers telling their customers that they can go 10,000 miles on their oil changes - knowing full well that they are only on the hook until that warranty ends - they are seeing problems at around 120,000 miles. And the manufacturer doesn't care.  

 

Those rings just don't have enough tension to come out of their lands when they get sooted and sludged up. They stay stuck in there. First the oil ring, then the compression rings, then your cylinder wall get scored, then it's game over. But that takes time and I think it can be prevented and even slowed down enough with the methods you are implementing (if the walls aren't damaged). And if the rings aren't too stuck.

 

Shorter intervals, periodic piston soaks. 

 

As you know, I now own a Toyota. Life has become almost boring. No oil consumption, no issues with the car. Just take care of it and drive it a ton. But Toyotas ARE developing engine problems now because of their 10,000 mile suggested drain interval. And it's not happening until later on (around the 100,000-120,00 mile mark). But there are youtube videos about it from Toyota techs. And if you ever talk to a Toyota tech, most of them will tell you the same thing...don't go 10,000 miles, stick between 4,000-5,5000 using a nice quality synthetic. My previous vehicle before my Silverado was a Lexus LS460, and I made the mistake of trying extended drains (as people were saying the 10,000 mile intervals applied to our cars too). Well, a few of us tried that on the forums...everything went great until we hit that higher mileage area of 120,000 miles. Then the oil consumption started...and got worse and worse. Ended up keeping mine until at 180,000 miles - at that point it was using around a quart every 1,000 miles - didn't try the piston soak, wish I had.  Probably still have that car today, if I had. 

Edited by Doublebase
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134,239 Miles

 

1,835 miles on this change. 761 to go for 2,500 mile target. 

There is some moisture in the filler cap but no white snot or foam.

It's been near zero here for quite a few days. This seems normal for an orifice vent system. 

Still full and the first time we've gone this far without observing some measurable usage. 

It is also unusually clean for this many miles based on past experience with this motor and this oil.

As we have used the same oil for some time I believe this means it's finally cleaning up. 

 

 

  

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Tire Review at 45K

 

Continental Cross Contact LX 20's. We mounted these retiring the Michelins at 90K. We've had some snow this year and coupled with this SUV's AWD it is quite sure footed. They are wearing very well. Ride very nice. Quite, very quite. Zero issues in the rain and more than is required in the summer. How spirited can you get with a 2.4 I4? They brake well, wet or dry. Grooved pavement is noticeable but not objectionable. I really don't have a solid knock on this tire for this application other that it seems they are quietly retiring this tire replacing it with the LX25. A tread pattern change. At least in the size this SUV needs. 

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135,000 Mile Service

 

02/23/2021

134,963 actual

2,559 miles this OCI

8 ounces total make up oil. for a usage rate of a quart per 10,000 miles.

 

5 Quarts COSTCO Kirkland 5W30 Dexos 1 Gen 2

1 PL15436 Purolator Pure One oil filter

1 AC-Delco OEM Direct Fit #22868414 passenger side wiper blade (torn)

1 Tire Rotation. Tires look awesome. 

 

Condensation in the fill cap and some white in the vent. Made it to 2,000 miles without a measurable usage than half a cup over a 300 mile Interstate trip. Topped of then none used over then remaining 200+  miles. Keeping a close eye on this. Did it kick 8 ounces of condensation out over the 5 hour road trip or is it using allot again? Next few weeks will tell on it. It's warmed back up here and now over freezing so the vent should be working better now. 

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