100k mile questions

'014SLTguy · August 22, 2015

Has anyone put a high number of miles on theirs yet? This is my first GM and being a new model also, I'm just wondering about any major issues encountered. I had a Tundra before and had no real issues (besides their no negotiating higher prices). I love my 14 SLT so far, though I'm only up to about 24k miles so far. I got an extended warranty out to about 75k. I just wanted to see if I may need to plan early on trading in or selling off as I get closer to the end of warranty. I do know highway miles aren't always going to wear down a truck the same way as stop and go city driving (especially on New Orleans high quality roads).

Surge-214 · August 22, 2015

Probably wont see anybody hit 100k miles on a 2014/15 for another full year or 2.

brokesilverado · August 22, 2015

I know a guy that has a 14 gmc cc 4x4 fully loaded with about 80,000 miles. It's his work truck & personal truck too & drives it alot. Only problem was the blend door for operating the vents to defrost to floor broke.

FL335i · August 23, 2015

I've had my truck 11 months, I have 28k. I do about 25k-30k/yr. This truck should be fine for 300k if well taken care of. It's a slowly evolved platform. No turbos etc. Engine is another cleaned up version of the SB Chevy. I would suggest 60k intervals on the transmission service. And I'm doing my front and rear diffs at my next oil change which will be around 32k. The rear diff had the fluid changed at 16k due to a axle seal leaking and warranty covered it, so they had to drain and fill it. But IMO, the whole reason I bought my truck over the other options like turbos, or a 8spd Chrysler etc. was knowing I was going to have a high mileage truck quickly how I drive. And I wanted low maintenance and simple maintenance. It was either the Tundra or Silverado IMO which are the two best for longevity and high mileage and simple maintenance that I could do at home. Silverado has the Tundra blown out of the water when you look at warranty coverage and MPG's in terms of a business vehicle. And here I am on the GM forum. It was the best business option on the table. Spark plugs will be a TBD item. I drove a lincoln MKZ with the V6 for work for a few years and the "100k" plugs were toast at 65k. So we shall see how that item goes on this truck. Again, simple and easy to do. I wouldn't worry about miles on this truck. Maintenance it and check the suspension for wear. Drive on.

Edited August 23, 2015 by FL335i

spectaculous · August 23, 2015

I've had my truck 11 months, I have 28k. I do about 25k-30k/yr. This truck should be fine for 300k if well taken care of. It's a slowly evolved platform. No turbos etc. Engine is another cleaned up version of the SB Chevy. I would suggest 60k intervals on the transmission service. And I'm doing my front and rear diffs at my next oil change which will be around 32k. The rear diff had the fluid changed at 16k due to a axle seal leaking and warranty covered it, so they had to drain and fill it. But IMO, the whole reason I bought my truck over the other options like turbos, or a 8spd Chrysler etc. was knowing I was going to have a high mileage truck quickly how I drive. And I wanted low maintenance and simple maintenance. It was either the Tundra or Silverado IMO which are the two best for longevity and high mileage and simple maintenance that I could do at home. Silverado has the Tundra blown out of the water when you look at warranty coverage and MPG's in terms of a business vehicle. And here I am on the GM forum. It was the best business option on the table. Spark plugs will be a TBD item. I drove a lincoln MKZ with the V6 for work for a few years and the "100k" plugs were toast at 65k. So we shall see how that item goes on this truck. Again, simple and easy to do. I wouldn't worry about miles on this truck. Maintenance it and check the suspension for wear. Drive on.

None of the intervals you have recommended follow what the manual says. Let's assume most of us drive what would be considered "severe service"... automatic transmission should be serviced (fluid & filter) at 45k miles. The manual doesn't even give an interval for changing differential fluid, so 32k is unnecessarily early number to pull out of your ass. Also, the original iridium plugs should easily make the suggested 97.5k mile interval the manual says to change them at. On my last Chevy, I changed the plugs at 96k like the book said and it wasn't stumbling around for that last 30k I had drove it.

I agree with your assessment that if well taken care of, these trucks should make it to 300k. But what the book says is good enough.

redwngr · August 23, 2015

The diff oil spec has changed, and is filled for life.

That said, if you do change it, use oil that meets the new spec.

tnchevy · August 23, 2015

I had plans of keeping my 2002 for at least 15 years but rust stopped those plans. Mechanically the truck was in good shape though. I would suggest not changing out the fluids (except oil and coolant of course), but just check them a couple of times a year. On my 2002 I changed the transmission fluid and filter every 30k miles but changed out the diffs and transfer at around 100k miles. After changing them my front diff started leaking out of both axle seals and continued to do that for 4 more years till I traded last year. My companys trucks get abused every day and we never change anything but the oil and unload them with 150k hard miles on them and have never had any major problems.

FL335i · August 23, 2015

spec- agreed, the severe service for the trans is 45k, but IIRC it's 97.5k or 100k for regular service. Hence why I threw 60k. With my driving and towing history I've had good luck with 60k intervals on my other company trucks. At 60k is when the fluid started to look like it needed a change. So the 60k is based on my 10yrs of construction business use driving GM 1500's. The diff is filled for life... if you want to buy that BS. I've built axles for my rock crawler and always do a break-in period to flush out particles. at 16k when my axle seal was leaking, the oil was nasty looking. Dark as coffee and yes I know GM uses the purple stuff. But I also know that the front diff is filled with conventional 80-90 lube. I use 4wd almost on a daily basis on my sites. And I've already towed and hauled some good heavy loads. And I've been wiping the magnet on the rear diff even after the axle leak repair and still am getting particles. I want 75/90 Full SYN fluid in both front and rear diffs. M1 or Valvoline Syn gear lube. And the G80 locker is mechanical, so I'm not worried about some proprietary friction modifier as with some LSD's. And the front diff is an open diff. I like my diff fluid super clean... just me. And brake fluid needs changed more often than the GM spec. BMW calls for 3yrs or 36K, which their OLM system also monitors brake fluid and brake pads. Brake fluid needs changed when it gets dark. Period. I live in FL, high humidity and I flush the brake systems out with a motive power bleeder. I'll be using the NAPA DOT 3 & 4 fluid as it has a higher boiling temp. In most European countries when you get your annual inspection, they sample your brake fluid and test it for "boiling temp" in a machine. And I've boiled the brake fluid on my corvette years ago more than once to learn that lesson. So I'm a bit more particular on my maintenance than most.

Rust. FL doesn't really have rust issues. I see 1975 corollas running around Tampa burning more oil then gas. I did 2 rounds of frame cleaning and painting on my truck using rustoleum's flat black enamel. 25k later and almost a year later it's looking like the day I did the repairs. And I haven't seen any other spots pop up either. I think the frame had some "spots" or areas that were not properly wiped before coating at the factory. B/c i on one spot it's perfect, then in 4 locations, like a rack that held the frame maybe, it was coming off. So I think my rust issues are behind me.

Edited August 23, 2015 by FL335i

galliher_nc · August 23, 2015

Probably wont see anybody hit 100k miles on a 2014/15 for another full year or 2.

There are a few on cars.com with 100k already.

topshelfproducts · August 23, 2015

My father in law has his 2014 silverado 1500 z71 5.3l over 140k miles, he works in the bakken and drives all day every day. Hasn't even had to change a light bulb, but he never serviced his transmission once and now it is slipping, so he will be trading in. He usually does every 2 years and only gets chevys. He changed the fluid and added lucas and it has stopped slipping, but he still wants to trade, other than that nothing but oil changes and he beats on it 7 days a week on gravel and dirt roads. Makes me more comfortable driving my gmc and taking care of it.