Make sure you have the proper viscosity of oil. 5W30 is what the specs are for a 4.6L engine.
AnswerYou have a serious problem here. Don't continue to drive this truck in this condition. Severe damage is being done in these 2 minutes. Your oil pump may be failing, or you may have a bad filter. Change filters to a Motorcraft filter immediately. If this does not cure the problem, have this looked at by an expert. AnswerI echo the previous, serious engine damage is likely to follow, would also suggest a stuck oil pressure sending unit. (Easy screw in replacement) try that first, but if it's still acting up, TOW IT IN.It means that the oil pressure switch is showing low pressure.
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.
Oil pressure has to built up. As long as the pressure is normal and the oil level is good. There is no problem.
4 minutes
about 5 to 10 minutes
yupps
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.
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It depends on the size of vessel and type of engine.