The difference between the L86 (sierra 6.2L) and the lt1 is the intake manifold, location of water pump and tuning along with some exhaust changes,they only spec the truck for 0w20 because of the number of trucks they sell (+900,000 in 2017)vs the number of corvettes and camaros (less than 100,000 in 2017), the CAFE savings is what drives the decision to spec the new trucks for the 0w20 instead of staying with 5w30 of the last truck generation v8's. The L86 and LT1 both use the same oil pump and internals so if 5w30 was such a big issue their oils would have changed also.
I have the 6.2L and run 5w30 mobil 1 EP or pennzoil platinum with confidence, GM and all oem's play the CAFE game to get best mpg. Look up the camaro and corvette (6.2L naturally aspirated) they both have the 6.2L v8 and they spec the 5w30 oil. The only thing different between the two is the intake manifold and tuning along with exhaust components that are not affected by oil use. Between the two truck lines GMC and Chevy they sold just over 900,000 trucks last year, the corvette and camaro sold less than 100,000 of both, the CAFE standards "fuel savings" (that you will never notice) that drives them to use these thin oils and is why the spec them for one and not the other.
Well I got the truck back today and they claimed nothing was wrong just an extra half a quart of oil no gas smell.... The two techs that diagnosed and originally took it in ran away and didn't come out till I was leaving, they changed the oil and said bring it back in a thousand miles and they will look it over again. The lady tried to tell me gas and oil also smell the same..... they brushed me off like nothing. Awesome to see how amazing GM customer service is.
I hope it is for all of you, if so I have no clue what is going on with mine and I am quite upset since a three month old truck with a sticker north of 56k and not even 8500 miles. I would be concerned with all the trucks and the vast mileage range this is popping up at, it could be some bring it back in ever 10-50 thousand miles for the same issue and just wait till it happens again out of warranty. $$$$$$$$
You should notice it drop from when your driving then come to a stop and are sitting there then when you drive it will increase to around 40 and if you go over 3500 rpm it will kick into high pressure mode and run anywhere from 60-80+.
It's a service bulletin for a collapsed valve in the afm cylinder that leads to the tick. This link should take you there. https://static.nhtsa.gov/odi/tsbs/2016/SB-10078567-7690.pdf
I took it in for an oil over fill and the heated seats wont come on with remote start, pulled it into the bay and they pulled the dipstick and instantly smelt gas. I was given an unlimited mile loaner and nothing else was said just I would get a call later.
Yes slight is normal, mine smelt like you were standing over an open gas can and I have a feeling the condensation was gas that was splashing on the back of the cap. The tech smelt the gas as soon as he pulled my dip stick didn't even have to put it by his nose it was that strong.
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