Oil pressure has to built up.
As long as the pressure is normal and the oil level is good.
There is no problem.
A good practice is to let your engine idle for a few minutes after starting so the oil pressure can build and lube all the internal parts of the engine. A vehicle with turbo should be idled before shutting off to let the turbo cool down.
you disconnect the battery for a couple minutes.
4 minutes
about 5 to 10 minutes
You have to disconnect the battery for couple minutes.
Oil pressure depends on the engine--my Cummins ISX runs at 40psi, some Detroits run at 50 and so on. If you're coming from empty tanks, you should see the Low Air light go out within two to three minutes after startup, and you want to have 110psi or more when you drive.
4
4
4
4
It depends on the size of vessel and type of engine.
It depends on the size of vessel and type of engine.