Mine is flex fuel also but older 209 and has 269K on it and my buds same truck same year only different color both with the 5.3 and his has 460 plus
Both of us have always used mobil 1 syn and change at 5000kms
My motor is as new inside and zero crud and no tappy ;lifters but gives 15 L best per 100 also think GM is over it's engine issues but only time will tell
For 2021 Silverado and Sierra trucks there were four recalls, none of which involved engine issues. and the engines identified ( generation 4 & 5 vortecs) with issues were below with 2015 they say being the worst
Important to remember even if your truck is in that group only 4-5% are having issues but I sure would be running syn oil with regular changes
The engine in question is the 5.3-liter Vortec in the following GM models:
- 2010-2016 Chevrolet Avalanche
- 2010-2016 Chevrolet Silverado
- 2010-2016 Chevrolet Suburban
- 2010-2016 Chevrolet Tahoe
- 2010-2016 GMC Sierra
- 2010-2016 GMC Yukon and Yukon XL
Doesn't seem to be a lot of engine complaints on the 2018 year
The 2018 Chevy Silverado was the second best selling truck of that year. So are there any underlying issues that people have noticed?
www.motorbiscuit.com
Cheers