2007 GMC 1/2 Ton 6.0 from North America
The engine in this truck is a lemon
Lost oil pressure at 90,000. Under warranty the dealer said the engine had a notorious problem with a dual lifter system. They replaced the lifters. I questioned the repair as a "band-aid"... as oil pressure is in the rod and cam bearings. Sure enough, it lost oil pressure at 200k and now I've found that not only are the lifters broken and not functioning, but the engine has a cracked crank... so far... the dealers have dropped this engine.
I can't repair a motor that was never supposed to work. They no longer make it and parts are not available... even thru the dealer. The 6.0 Vortec max was junk from the get go, and I cannot even find one used. This is what I bought? What am I to do... I use it for work, and for now I'm walking.
Would you buy another car from this manufacturer? No
Review Date: 20th September, 2013
Welcome to the world of GM... I had a couple of their vehicles, both had problems and GM and their dealerships leave the customer hanging... Sorry to hear about your misfortune.
I have since quit buying anything remotely associated with GM.
Sounds to me like the owner neglected to maintain his engine. If you had low oil pressure, you should've had an oil analysis done to be sure the oil wasn't getting contaminated with gasoline. A leaky fuel pressure regulator will contaminate oil and cause it to lose viscosity, causing a low oil pressure condition. Also this may seem petty, but use an AC Delco oil filter when you change your oil. The other brands cause dry start conditions. Change your oil regularly. Good luck next time.
Well, 200k miles is a lot; expect some problems at that point with any truck. The older GM trucks with 305 and 350 engines were bulletproof reliable. I prefer those instead.
G.M. produced hundreds of thousands of 6.0 Vortec engines, and you can't find a used or re-built one, nor any parts anywhere? You must not have looked very hard. This review is not credible to me.
Some people ignore the gauges and keep driving. Might have just needed a new oil pump. I saw this on a C5; rare, but it can happen.
I change the oil on my high mileage GMC truck at least every 5,000 miles with synthetic and quality filter, to avoid oil starvation conditions. If I put on 30,000 miles annually like the reviewer, that would be 6 services a year. Did the reviewer do this? No engine with such high mileage can survive without proper maintenance. You are correct, the engine would've shown gradual signs of a problem, and rushing from job to job, to meet his daily quota, the reviewer probably ignored them.
As for the 6.0 Vortec being "junk", the only design problem was cold start piston slap in the 1999-02 versions, that was fixed by reducing piston-cylinder wall clearance.
The only reason that there could be that there's no market for re-builds or parts (according to reviewer), is that virtually all of these engines are still in the trucks they left the factory with, and are performing well enough to not need replacement.