07 Suburban (5.3) radical fluctuation in oil pressure
Oil pressure will fluctuate rapidly between 20 psi and 60 psi. Needle will fall to near zero triggering the message center warning system to shut engine down immediately do to low oil pressure. Is this typical of a faulty sending unit or are the problems deeper than this ? This vehicle has also been in the Oil consumption program for the past three years and recently written off as normal ( 1 qt in 1000 mi ) Vehicle now has 108,000 mi.
I'd try replacing the oil pressure gauge sending unit. Sounds like it's faulty. Service the PCV system and see if that improves the oil consumption. If this truck has not had regular oil changes the bearings may be failing. HTH. -Jim
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