drivereye

I took my truck in every Saturday and they documented any top ups they did. This went on for over a couple months. If your consumption is under the max allowable amount they will tell you your truck is not covered under warranty.

What makes you think it’s not burning? if it’s not leaking…?

50k is when i noticed my oil light. Every other Saturday for about 3 months the service dept. would wait 15 minutes and document then top up the oil. Then a month in the shop to change out the block for a scored cylinder wall. They are looking for a consistent consumption of over 1 litre for every 3200km (which is a joke think over 3 litre per oil change is acceptable).

The remainder of the existing warranty is longer than the warranty they would have but on it.

They did replace the block

Truck is finally back after a month. seems good so far. here is a excerpt from the work order… if any cares. “Plugs pulled - all plugs are heavily carboned/contaminated. Oil residue on cylinder 4,6 plugs. Boroscope shows light vertical scoring on cylinder walls along with oil residue on piston edges and build up ontop of piston assemblies. Oil residue on cylinders 1,5, 7 plugs Contaminated plugs. Scoped found cylinder 1 piston has wiped out cylinder walls. Cylinder 3,7 show similar scoring as to even bank. At this point in time recommend short block for vehicle due to cylinder wall scoring” Tom

6.2 91 octane only variable I could control would be changing oil sooner. Dealer is putting truck back together instead of getting me a rental until the parts arrive (estimating 2-3 weeks). Said it would be a two day install.

first two oil changes were free at dealer third I did. the 4 and 5 was done by dealer to verify proper procedure for the oil consumption tests. The oil light came on when it was well over 2 litres down, so Im sure the burning started long before 40000kms.

Just over 50000 km now I was not monitoring the oil consumption at first, it was around 40000 when the oil light first came on and I started paying attention.

update after several months of oil consumption test by the dealer, they acknowledged excessive oil consumption. The loss they recorded was inconsistent, but always excessive. I was going through 5 litres between oil changes. They called today and said the cylinder wall was scored. They ordered a new block under warranty. I am curious if the valves would be compromised in any way from the excess oil burning.

I agree that for the next round I will be as precise as possible on monitoring the levels to rule out any unexpected variables. I have a hard time understanding how if I have a slow consistent burning of oil, that the dipstick will not indicate anything before 4000km checking at gas station. But again, I can verify this by checking oil in the mornings. What i am curious about is what could possibly cause an oil loss in a 500km period but not other 500km periods. If driving habits and routes stay generally the same?

I should clarify. I am recording dipstick levels and odometer for diagnostic purposes because i am losing large amounts of oil at inconsistent times. Same drive, same gas station, same timing (fill, clean windows, check oil). Yes i know it is not 15 minutes or two hours but it is consistent. I park on an incline so overnight would be inaccurate (but still consistent, so perhaps ill try that as well) The only significant variable would be the outside weather, but the engine temp would minimize that enough at least for these purposes. Guys, I get the nuances of oil quality, dirt, temp, timing effecting dipstick readings, but we are talking about full, full, full, full, litre down. Top up or change oil and do it again. Tom

loosing oil on 2020 sierra 6.2. Oil let came on. Topped up and dropped off at dealers. They found no leaks and set me up to do a consumption report. After 3200km the dipstick did not budge and the dealer said there appears to be no issue. Next fillup I found i had dropped another litre. So I took pictures of every oil check at every fill up. Same pattern no oil loss until 4000km then i suddenly lose a litre. Not towing, no changes in driving patterns. Black tailpipes, no leaking, drives fine, noisy idle when sitting in driveway. Sending pictures to service manager monday. Any thoughts? experiences? Tom

New truck back at dealers. I have owned it a week and a half and most of that was in the shop for the shift out of park issue. This time it is a flashing engine service light that happened at 100km/hr. I am not sure how long, as when I noticed it, it stopped. Checked the code when I got home and it was p0300. Dropped it off at the dealers and they ran it, checked it, called it in, cleared it and shrugged their shoulders. cylinders 3 and 8 showed a history of misfires. Suspect a faulty dynamic fuel system, but not sure until that throws a code. hopefully is was a random once only, but I am losing my confidence to be driving anywhere remote.

Truck back. Part 84800777 replaced. No issues yet.