High Engine Hours

Transient · April 17, 2023

If it's cheap enough is take it. Just my opinion. I'm almost at 44k miles on my 2020 and it only has 1400 hours on it. Auto start/stop doesn't engage when the truck is in Park. Whenever you come to stop, the auto start/stop turns off the engine, and you then shift into Park the engine comes back on. Mid to higher trim levels do differentiate between run time and idle time. Iirc, even with 44k miles, my truck only has a few hundred idle hours on it. The truck you're considering was definitely sitting and idling for long periods of time. Was it a border patrol truck where an agent sat in it and let it idle so they could have AC?

swathdiver · April 18, 2023

9 hours ago, Transient said:

Was it a border patrol truck where an agent sat in it and let it idle so they could have AC?

Or some guy on his way home from dinner whose wife told him she was going to run into the store for just one thing and 5 songs later comes out with bags of stuff! LOL

KARNUT · April 18, 2023

Most outdoor workers truck’s start in the morning and shut off again at home. I know of one crew and truck supplier with about 20 crews. His average trade in is 300K miles. They usually run 10 day rotations out of town. Once at the job area they may travel 10-15 miles to the job. I imagine the engine hours at dark to dark running are very high. I’ve never seen adverse effects of it. Just another thing for the worried to worry about.

Silverado4x4 · April 18, 2023

6 hours ago, swathdiver said:

Or some guy on his way home from dinner whose wife told him she was going to run into the store for just one thing and 5 songs later comes out with bags of stuff! LOL

Or some guy slept in his truck because the wife kept throwing him out of the house alot so he had the AC or heat running in the truck.

Grumpy Bear · April 18, 2023

Fun with math:

Truck has 40,000 miles on it and 3,400 engine hours. newdude says GM uses a 33 mile to an hour wear estimation on warranty. I would imagine that is the 'wear' equivalent based on their testing. The average driver drives 14K a year (The Zebra.com from 2022).

So this 2019 truck is about on the money miles per year. Check

40K / 33 = 1212 engine hours would be 'normal'

3400 - 1212 = 2188 idle hours or it idled 6 hours a day, day and day out for exactly 365 days, 1 year.

Idle speed of 550 rpm is 33,000 rpm per hour

198,000 rpm per 6 hour day.

73.27 MILLION revolutions idling.

144.54 MILLION trips up and down the cylinder

That's 43.602 MILLION feet or 8,258 miles the rings were drug over the cylinder face.

I know nothing about this truck but I do know that if I leave Pepper idle prolonged periods the oil temperature tends to bounce off the cooling fan limit with puts oil temp over 220 F and at 550 rpm the velocity component of the Stribeck Curve is pretty darn low. Even though the load is low the piston stops twice per rev so much of the stroke length is in boundary layer lubrication. Meaning that for the most part this power cylinder is at the mercy of the add pack an as the oil change interval is sketchy perhaps even depleted for some portion of those 8K miles they were drug across iron. Forget the idea it takes about 180 C or 356 F to activate the wear package.

So, imagine a piece of steel drug 8 THOUSAND miles over steel that had been but dampened with 3 in 1 oil at a speed of roughly 3.8 mph. That's the mean piston speed of a 3.62" stroke at 550 rpm.

Do you think that this would not result in wear equal to GM's study that would put this motor hours wise at 112K miles?

In the average of circumstances only 0.3% of all vehicles make it to 200K. Ya got something less than 88K miles left. How much do you want to pay? It's a rhetorical question.

Edited April 18, 2023 by Grumpy Bear
gramar and spelling

swathdiver · April 18, 2023

5 hours ago, KARNUT said:

Most outdoor workers truck’s start in the morning and shut off again at home.

I used to do this with my '96 F150 with a 302 V8. Fired it up at 0530 and didn't shut it off until I got home around 5. Drove about 50-100 miles between job sites and left it running so it was nice and cold when I hopped back inside AND one less thing to fail by starting and stopping the motor all the time in remote areas. She averaged 12 mpg still. Never had a problem with the engine or its accessories after ten years.

Gangly · April 18, 2023

The few issues these motors can have also directly link to improper oil service intervals once the miles start to add up. Also, I thought GM Certified Pre-Owned came with an automatic 100K mile extended warranty? If it only has 40k miles and they aren't willing to put an extended warranty on it, that should tell you everything you need to know. It would be a hard pass for me.

Edited April 18, 2023 by Gangly

repairman54 · April 19, 2023

They usually do not certify preowned vehicles with more than 10k miles unless in the current year and not ones 4 model years old either.

40k miles is just preowned (used) and usually just a 30 day warranty.

Edited April 19, 2023 by repairman54

dieselfan1 · April 19, 2023

56 minutes ago, repairman54 said:

They usually do not certify preowned vehicles with more than 10k miles unless in the current year and not ones 4 model years old either.

40k miles is just preowned (used) and usually just a 30 day warranty.

I just traded my 22 LTD High Country 6.2 with 22,000 miles for a 23 High Country 6.2.

They won't sell it as certified because I did my own oil changes and they have no record of it.

I gave them my maintenance records ( oil changes only) and they didn't want it.

The truck is still for sale a month later for 60g.

Grumpy Bear · April 19, 2023

46 minutes ago, dieselfan1 said:

They won't sell it as certified because I did my own oil changes, and they have no record of it.

I gave them my maintenance records (oil changes only) and they didn't want it.

Ya can't fix stupid even with Duct Tape and WD40. It's a nice truck that needs a nice home.

GETGONE · April 19, 2023

1 hour ago, dieselfan1 said:

I just traded my 22 LTD High Country 6.2 with 22,000 miles for a 23 High Country 6.2.

They won't sell it as certified because I did my own oil changes and they have no record of it.

I gave them my maintenance records ( oil changes only) and they didn't want it.

This is the latest scam I learned about a couple months ago. I had an oil light message come on and stupid me reset it to see if it would come back. I was near the dealer I bought it from so I stopped in to ask about it. They asked about oil changes and I said I did them myself and I had a record of when I changed it and with what. They suggested having it changed at the dealer so they have a record of it in their computer. They just want to get more money from service or screw you on trade value. The service guy said I should keep all my receipts for the oil and filters I buy as proof. I don't specifically buy stuff at the same time for an oil change. If I find a deal on filters, I'll stock up. If I find a deal on oil, or I don't have enough left in my stash in the barn, I'll buy more, but not the 8 quarts at once the truck requires.

KARNUT · April 19, 2023

41 minutes ago, GETGONE said:

This is the latest scam I learned about a couple months ago. I had an oil light message come on and stupid me reset it to see if it would come back. I was near the dealer I bought it from so I stopped in to ask about it. They asked about oil changes and I said I did them myself and I had a record of when I changed it and with what. They suggested having it changed at the dealer so they have a record of it in their computer. They just want to get more money from service or screw you on trade value. The service guy said I should keep all my receipts for the oil and filters I buy as proof. I don't specifically buy stuff at the same time for an oil change. If I find a deal on filters, I'll stock up. If I find a deal on oil, or I don't have enough left in my stash in the barn, I'll buy more, but not the 8 quarts at once the truck requires.

Most vehicles have change oil lights. All manufacturers want maintenance records. I can change oil, engines, transmission, etc. and rebuild them. My under warranty vehicles get dealer service. Most still do after properly vetting them. Most of my vehicles are purchased at the same dealers. They’ll match other offers. It’s good to build relationships. They’ll send coupons. I just got one online for my wife’s car. Full synthetic with a rotation for 60$. I’ve been using them for 30 years.

Grumpy Bear · April 19, 2023

2 hours ago, GETGONE said:

This is the latest scam I learned about a couple months ago. I had an oil light message come on and stupid me reset it to see if it would come back. I was near the dealer I bought it from so I stopped in to ask about it. They asked about oil changes and I said I did them myself and I had a record of when I changed it and with what. They suggested having it changed at the dealer so they have a record of it in their computer. They just want to get more money from service or screw you on trade value. The service guy said I should keep all my receipts for the oil and filters I buy as proof. I don't specifically buy stuff at the same time for an oil change. If I find a deal on filters, I'll stock up. If I find a deal on oil, or I don't have enough left in my stash in the barn, I'll buy more, but not the 8 quarts at once the truck requires.

I've never give a warranty two seconds of my consideration. I give the dealer my guarantee instead.

If you won't stand behind what you sell, I guarantee it's the last thing I buy from you.

I take care of it better than any manufactures suggested maintenance interval. I do it on shorter intervals, better products and drive and maintain with the care only an invested in himself owner/operator will give it. If that doesn't mean something to them, it will to someone else. For decades guys line up to buy what I'm willing to sell and I'm not willing to sell much. I always get my price or it goes in the ground. That's been tested My good stuff I keep. My lemons I don't dump on anyone. If they really want it, I explain in painful detail its faults and if they still want it..... Sometimes I just give it to them.

Dad made an impression on me as a child about property. "When you borrow always take it back in better shape than you receive it. If you do that, people will lend you anything and as often as you require." He was dead right. "They will also give you top dollar for whatever you are selling". Obviously this does not include dealers. Dealers are not people. They just look like one. :crackup:

customboss · April 19, 2023

2 hours ago, GETGONE said:

This is the latest scam I learned about a couple months ago. I had an oil light message come on and stupid me reset it to see if it would come back. I was near the dealer I bought it from so I stopped in to ask about it. They asked about oil changes and I said I did them myself and I had a record of when I changed it and with what. They suggested having it changed at the dealer so they have a record of it in their computer. They just want to get more money from service or screw you on trade value. The service guy said I should keep all my receipts for the oil and filters I buy as proof. I don't specifically buy stuff at the same time for an oil change. If I find a deal on filters, I'll stock up. If I find a deal on oil, or I don't have enough left in my stash in the barn, I'll buy more, but not the 8 quarts at once the truck requires.

List the work on the myChevrolet app. My dealer accepts that for warranty.
GM can see it.

KARNUT · April 19, 2023

8 minutes ago, Grumpy Bear said:

I've never give a warranty two seconds of my consideration. I give the dealer my guarantee instead.

If you won't stand behind what you sell, I guarantee it's the last thing I buy from you.

I take care of it better than any manufactures suggested maintenance interval. I do it on shorter intervals, better products and drive and maintain with the care only an invested in himself owner/operator will give it. If that doesn't mean something to them, it will to someone else. For decades guys line up to buy what I'm willing to sell and I'm not willing to sell much. I always get my price or it goes in the ground. That's been tested My good stuff I keep. My lemons I don't dump on anyone. If they really want it, I explain in painful detail its faults and if they still want it..... Sometimes I just give it to them.

Dad made an impression on me as a child about property. "When you borrow always take it back in better shape than you receive it. If you do that, people will lend you anything and as often as you require." He was dead right. "They will also give you top dollar for whatever you are selling". Obviously this does not include dealers. Dealers are not people. They just look like one.

That’s fine if every product or person lasts exactly the same. No warranty or life insurance is necessary. No dealer is going to back a vehicle repair without it being backed by the manufacturer. I wouldn’t ever buy a new vehicle without a warranty, most people wouldn’t. I wouldn’t dream of having 3 children without putting a warranty on myself. It’s called life insurance, same difference. Every product has a warranty. Warranties are free and good business. I had one V-10 blow up. We had 3 all used exactly the same way. One was bad. Fixed for free under warranty. If I was to buy a new vehicle especially a GM I’d buy an extended warranty.