Driving in M5 all the time

mike5511 · September 23, 2015

I'm averaging 19-20 mpg a tank driving in M5. This is mostly miles at 55 - 75 mph in hilly/curvy country. 6th gear is pretty much useless where I live I've concluded. I'll use it when on a Interstate type highway in relatively flat country, but it won't help me where I do my daily driving.

Somebody asked about "WHY RUN IN M5"?.... To prevent excessive oil consumption because of bad rings and pistons......ask a good mechanic or do a little google search. GM says 1 qt of oil every 1000 miles is NOT excessive. I disagree. Running in V4 causes this problem.

txchevy4ever · September 23, 2015

Through my 7000 miles, I haven't burned a drop of oil.

Dropsix · September 23, 2015

Through my 7000 miles, I haven't burned a drop of oil.

Ditto, I haven't burned any oil as of yet. Approx 14k Miles

Britt Lifsey · September 23, 2015

Through my 7000 miles, I haven't burned a drop of oil.

Ditto, I haven't burned any oil as of yet. Approx 14k Miles

Y'all better schedule service to have that lack of oil burning corrected...

Potts · September 24, 2015

Ditto, I haven't burned any oil as of yet. Approx 14k Miles

And you let the AFM behave as designed?

I aka because these posts concern me. I don't mind the AFM and find it to be butter smooth on my truck about 95% of the time and would rather just drive and not think about it; but if it's really not going to be good for my engine in the long run I'd rather prevent that. I plan on keeping this truck a long time.

Can someone provide an article from a reliable source talking about issues the AFM causes that result in oil consumption?

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Edited September 24, 2015 by Potts

Dropsix · September 24, 2015

And you let the AFM behave as designed?

I aka because these posts concern me. I don't mind the AFM and find it to be butter smooth on my truck about 95% of the time and would rather just drive and not think about it; but if it's really not going to be good for my engine in the long run I'd rather prevent that. I plan on keeping this truck a long time.

Can someone provide an article from a reliable source talking about issues the AFM causes that result in oil consumption?

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Yup totally stock and I let all 6 gears do their thing with AFM in 6th.

I've also heard (many times) that AFM decreases engine life but so far so good. I don't know. Trying not to worry about it.

newdude · September 24, 2015

There are plenty of GMT-900 trucks out there that don't burn a drop. I wish I kept my 2012 just to test this. No Range or any other AFM disable, driven 95% of the time in D and never lost a drop of oil in the 41,000 miles I had it.

glcbn · September 24, 2015

IMO,I think it's more how well your pistons and rings seated in the first few hundred miles, rather than AFM causing oil consumption. I have close to 29,000 on my truck. Changing oil this Saturday. Oil monitor down to 23%, and by Saturday will be just about 6,000 on the oil. Checked oil level today. It's barely, if at all off full. In fact it's been this way since day one of owning it.

I tried M5 for a while, and by that I mean maybe a couple weeks. Other than that it's always in drive. Never know when it does the V4 thing either. Smooth as glass, unless I'm going slow like under 30mph.

Potts · September 25, 2015

You guys do your first oil change at around 2k miles? I like to do my first one early and then follow the maintenance schedule to get the break in junk out of there, but I hear more and more how they are broken in at the factory and it's not needed.

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glcbn · September 25, 2015

You guys do your first oil change at around 2k miles? I like to do my first one early and then follow the maintenance schedule to get the break in junk out of there, but I hear more and more how they are broken in at the factory and it's not needed.

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Potts,I had them do my first at 200 mile. Probably anal but I felt better with factory oil out of it.

LongrangeLauber · September 25, 2015

Oil at 800 miles, trans tcase and diff at 2k

Dropsix · September 25, 2015

I did my first oil change at 10k kms.

We need some sort of script on this forum to convert miles and kms haha. Like when I read posts from you Americans, it'll show up in metric and vice versa.

Potts · September 25, 2015

Thanks fellas. Anyone have a link to a good write up for DIY oil change and oil filter replacement? I'm gonna take advantage of my free two years maintenance, but for this first quick one I just want to do it myself. I haven't checked yet, but I probably don't even need to jack her up to do it - I didn't have to with my jeep and the clearance is similar.

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mike5511 · September 28, 2015

The ring thing happens after 40,000 miles and far short of 100,000. I'm not a mechanic, but I've had several GM mechanics explain this to me. Plus the info is on-line if you are curious to go check. You guys who act like this is a fable get back to us at about 60,000 - 70,000 miles and let us know. After the research I've done, I've decided to not take the chance. To each his own.

mudeater · September 28, 2015

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.