'04 3.5 4x4 z85 230,000 miles, no major repairs and still running strong! No codes! No leaks! Great truck! I do have to add a quart of oil between oil changes, I use full synthetic and change oil about every 5,000 to 7,000 miles. Very impressed with this goofy little 5 cylinder motor!
2005 cc z85 369k no major repairs other than the head being replaced under warranty at 89k. Synthetic oil every 5k no oil between changes. Best vehicle I have ever owned. I also own a 16 4x4 colorado duramax with 105k.
Bought used with 141k 5 years ago. Oil and filter when light tells me to. Full synthetic w/ quality filter. Burn a couple quarts between changes. 1 and 3 cylinders are low in compression, but the other 3 make up for it. Just got a tune for this rig and the bitch runs kickass. I'd drive it anywhere!
No major repairs. Rear main seal, water pump, couple sensors is all in 5 years.
2005 Colorado i5. I have 67K on it (don't drive much anymore). Been using synthetic oil since I got her in 2012 - Mobile 1 at first and now Valvoline. Doesn't use a drop of oil. Never had any engine issues except for the common rattle on start-up. Love this truck.
04 z71 with 191k on it. Fuel trims are a bit off, and it rattles on startup. I suspect it needs a new cat. Also, she does burn oil. I have a head sitting here that I need to send out for a valve job. Just haven't gotten around to it quite yet.I did have to have the entire cooling system redone last year. Water pump/thermostat were both bad. Radiator supposedly had a small leak, but I've not seen any evidence of that, and it's still holding coolant just fine.
110,000 miles 2005 Z85 3.5 L. Head rebuild at 95k intake cam and several rockers at the same time, other wise just normal maintenance, dio oil at 5 to 6 k good oil filters. Since the head job I developed a cam speed tick at full temp, at idle and 6 exhaust lifters replace but that did not solve it. Replaced Cam solenoid, and both O2 sensors as maintenance.
2005 I5, ordered new, 260,000 miles and I put everyone of 'em on it. No major problems. Change oil and filter when "Oil Life" comes on with High Mile Mobil 1 Syn. 5w30 and AC PF61 filter. Replaced water pump and radiator at 200,000 miles and still rollin'.
Recently had oil pressure switch go bad, watched You Tube video of some bozo talkin' chit saying removal of RF Tire and fender well liner required to change it. BS. Looked under the hood, over the oil filter, there it was, removed with a small crescent, replaced, easy peasey. Can't rely on some people, need to look for yourself.
Great motor for general gettin' around, sure you could rough it up and tear it to hell if you wanted to, I prefer to take reasonable care of it and just ride.
I got a 2008 3.7 in August 2019 with 71,500 miles. Now its at 83,400 and no issues. Had a check engine light here for a week but could have been shitty 85 octane tanks of gas when I passed through Wyoming a couple weeks ago. Never skipped a beat. does rattle on startup tho, but I guess thats normal.