The idle speed of 600 you mentioned is really low, and 760 is also high when the 4S shop measures your idle speed, but it is within the normal range. The idle speed value of a hot car should not change much, basically a car is a fixed value. You just missed the160th turn. I don't know what the facts are. If the idle speed is really unstable, it will go up and down. I suggest you go to the 4S shop and tell the repairman to check it carefully. There are many situations caused by unstable idle speed, so I won't explain them to you. By the way, you can apply for vehicle reinsurance at the 4S shop for free. Jetta 2 years 60,000 kilometers
7-8 Jetta's oil consumption in urban areas is within the normal range, and 8-9 Jetta's oil consumption in summer.
As for the starting problem, I feel that it is a problem of novice oil sharing and cooperation. You can try an old driver, and if the problem still exists, go to the 4S shop for inspection.