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Driving in M5 all the time


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#46 mike5511

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Posted 29 September 2015 - 12:51 AM

My white 2014 had over 20,000 miles from April to December and never used any oil. All three oil changes completed by the dealership when the OLM told me to change it. Truck didn't smoke, leak or burn oil. I ran it on 87 octane and according to my fuelly account I tracked 15220 miles and averaged 15.5 mpg. It was a 5.3L 6sp w/3.42 gears I put it in auto and let it do its thing.

20,000 is half of 40,000....which is where the oil consumption problems seem to  start showing up. I'm sure some of us would spend more time in V4 than others, thus some may get more miles before problems show up, or have no problems at all. GM didn't do this because it is good for your motor, they did it to help meet CAFE standards. Why take the chance if you plan on keeping your truck?  



#47 mudeater

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Posted 29 September 2015 - 02:14 AM

Okay I've got a 100,000 mile power train warranty so it's still on GMs dime to fix it. This isn't rocket science either it happens or it don't nothing anyone can do to prevent it. Naysayers blame it on AFM. Others blame it on mechanical parts. There is always a chance anything mechanical can break. I am on my third AFM truck and haven't had any issues when I do then I will fix it. With as many as these trucks on the road with it the few that have this issue makes it the least of my worries. I have a better chance of being hit by some one playing on the telephone than having oil consumption problems. It's your truck and warranty tune it out leave it factory I could care less. Who cares.


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Edited by mudeater, 29 September 2015 - 02:25 AM.

Current Truck Purchased Dec 2014: 2014 GMC Sierra Crew Cab SLT Z71 4x4 Iridium Metallic/ July 14 build/ 6.2L 6spd and 3.42 gears/ Cocoa Dune/ 

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The general got this one right I wouldn't trade this truck for anything.


#48 mike5511

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Posted 29 September 2015 - 05:33 PM

Okay I've got a 100,000 mile power train warranty so it's still on GMs dime to fix it. This isn't rocket science either it happens or it don't nothing anyone can do to prevent it. Naysayers blame it on AFM. Others blame it on mechanical parts. There is always a chance anything mechanical can break. I am on my third AFM truck and haven't had any issues when I do then I will fix it. With as many as these trucks on the road with it the few that have this issue makes it the least of my worries. I have a better chance of being hit by some one playing on the telephone than having oil consumption problems. It's your truck and warranty tune it out leave it factory I could care less. Who cares.


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Unless you are using more than 1 qt every 1000 miles, GM will tell you nothing is wrong.  You know I just passed on the information. I've said all along DO WHAT YOU WANT!  No need to get testy!

"WHO CARES"? Well if you don't, why did you bother to comment at all? Why did you even click on this topic?  This is what forums are for. I got my information from GM MECHANICS with about 50+ years of combined experience.......Probably know a little more about it than you I'm guessing! And I'm positive they know a whole lot more about it than me.


Edited by mike5511, 29 September 2015 - 05:39 PM.


#49 snowman24

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Posted 17 February 2017 - 11:08 AM

I have a 2009 Silverado. 5.3 vortec. After my last oil change I checked the oil every 500 miles. I was burning, losing, using 1 quart per 500 miles. I've never noticed smoke. It doesn't leave marks on driveway. I topped it back off and have been driving in M5. First 500 miles when I checked, expecting to add a quart, it was right on level. Didn't have to add a drop. What's is the best programmer that won't break the bank? What's the benefit of using the programmer as opposed to driving in M5? I realize this is an old post but I thought I'd try anyway.

Edited by snowman24, 17 February 2017 - 11:09 AM.


#50 Donstar

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Posted 17 February 2017 - 11:42 AM

I have a 2009 Silverado. 5.3 vortec. After my last oil change I checked the oil every 500 miles. I was burning, losing, using 1 quart per 500 miles. I've never noticed smoke. It doesn't leave marks on driveway. I topped it back off and have been driving in M5. First 500 miles when I checked, expecting to add a quart, it was right on level. Didn't have to add a drop. What's is the best programmer that won't break the bank? What's the benefit of using the programmer as opposed to driving in M5? I realize this is an old post but I thought I'd try anyway.

My 2009 Sierra, 5.3 also went through oil as you describe.  It had nothing to do with the transmission and  had major engine work done a 50k miles all under warranty. Next 100k miles I never had to top off oil between changes!



#51 ChevyMan2015

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Posted 17 February 2017 - 12:43 PM

My 2015 just rolled over 19,000 miles. I haven't used a drop of oil. I don't use manual. I let the AFM operate as designed.



#52 pl8man

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Posted 17 February 2017 - 08:53 PM

Keep mine in M5 at all times, it's still an overdrive ratio.   0.85:1



#53 MyFavTruck

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Posted 17 February 2017 - 09:13 PM

I have not seen a lot of oil burning problems on the new DI engines 2014 and up. I like a lot of other 2009 5.3 Aluminum block owners had a oil consumption problem with it all the way up to 82,000 miles at tradein time. My 2014 5.3 never needed any oil added between changes up to 61,000 miles at tradein time and you can bet that I am checking regularly after that 2009 truck LOL. This 2016 6.2 is doing OK at 14,000 miles no sign of oil consumption so far. Would like for someone to point out a thread where a 2014 plus DI engine has an oil consumption problem. I cannot seem to find anything with the search feature?? 

Here is a spark plug pic out of my 2009 5.3 yup she burned so much oil that she fouled the spark plugs!!

IMAG0842-1.jpg


#54 snowman24

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Posted 17 February 2017 - 11:11 PM

Strange thing on mine. It would show a misfire and when I pulled my plugs out to replace them they all looked good. No oil just a white chalky appearance.

#55 snowman24

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Posted 17 February 2017 - 11:13 PM


My 2009 Sierra, 5.3 also went through oil as you describe.  It had nothing to do with the transmission and  had major engine work done a 50k miles all under warranty. Next 100k miles I never had to top off oil between changes!

I had the same thing done on mine @ about 70,000 miles.

Edited by snowman24, 17 February 2017 - 11:14 PM.


#56 Billy346

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Posted 18 February 2017 - 05:01 AM

I drive mine in M5 when I'm around town then put it in M6 when I'm on the highway. (M6 does not lock out V4 mode).

Where I live there are lots of hills and lots of stop lights. I rarely get over 50 MPH for very long. Keeping the truck from shifting all the way into 6th gear gives me a little better throttle response around town. There is nothing more frustrating than driving up a hill and having the engine bog because the tranny only has it spinning at 1200 RPM.

On the highway, V4 is great. I rarely notice the switch in terms of throttle response, but the gas mileage improves substantially.

I think other posters have hit it on the head. You don't really notice the switch between V4 and V8 unless you are watching the indicator on the dash. (Unless you have a non-factory muffler, in which case, you can hear the difference in the exhaust note.)

2b03d12e-8e95-47cc-a11d-4ccb00bb7d65_zps

 

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#57 Donstar

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Posted 18 February 2017 - 08:47 AM

Ok so I've had my truck a week now and I love everything about it except the worthless AFM. Would it affect the longevity of the engine and or transmission to just leave it in M5 all the time ? Would the extra rpms take a toll over time on the engine ? I have the 3:42 ratio. It pulls just fine in 6th gear when it's in V8 mode so I know it's the AFM causing the delay. And also I'm thinking by not letting the AFM operate it would prevent any possible oil consumption issues that some have had with the AFM system.

The technology of using only four cylinders when more are not required is an asset to these trucks. Defeating this feature is a waste, imo.  If your AFM is causing a performance problem then your truck needs repair.  You definitely should be able to use "D" for most of your driving needs.





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