Z71 2012 Gasoline mileage: 250 KM Peace be upon you and God's mercy and blessings, I have an engine that I removed from the car to replace it with a bigger one. There is a video of the engine running before it was removed. The specifications of the engine are 5.3 Sierra, model 2012, and it had 250,000 km on it before removal. It has no issues at all, no noises or anything else. Its oils are German Liqui Moly and were changed regularly before every 5,000 km. The attached picture is for illustration. If anyone wants to contact me via WhatsApp, I can send them the video of the engine.