Have you ever tried to use a sharpening stone on a can opener irl? I don't think the devs intended the can opener to be repairable with a sharpening stone.

Same issue here, though server restart is not required for this to happen. Just put any oil barrel into a lada inventory and it's there for good, no removing it at all.

To add further, there does seem to be an issue with vehicle performance on hills. The ADA 4x4 has ZERO testicles when it comes to any sort of hill climb, especially off road. Like OP said, it is like a car trying to climb a hill in fourth gear from a dead stop, the gear ratio for first seems absurdly high and this has prevented me from accessing my base with vehicles.

As a temporary fix, you can spam Q to downshift so the hud reads the car as in Reverse. Once in reverse, continue mashing Q for a few seconds, then slowly shift into neutral and then first. This seems to be a sync issue between the hud and the car. Leaving the car while it is in any gear that isnt neutral will set the hud to show neutral regardless of what gear the car is in, and changing gears from that state will cause issues. spamming Q for 10 seconds before beginning a drive and then shifting from there will help!

Can reproduce characters launching into the air on contact with vehicles by opening vehicle door and sprinting at driver seat.