oil pressure loss after truck is at oper temp !!
i replaced oil pump and pick up ,timing chains,osunit,55 psi at cold idle ,after about twenty min at idle it goes to 30 psi if i idle it at 1500 rpms it goes to zero ,i,m useing a mechanical op gauge ,is it the cam bearings ??
Many old/high mileage vehicles that have this issue have changed to an oil with a higher viscosity or used an additive
i put in mobil 10/40 still loosing pressure !!
At this point you've got few options .... STP (do they still make that?) or rebuild.///interesting article at /////// http://www.germanformula.com/5-causes-of-low-engine-oil- pressure/ \\\\\\ The oil filters play an important role in maintaining oil pressure. Should the filter get clogged it will reduce the pressure. The pressure relief valve of an oil filter is there to make sure the pressure does not get too high. However, if the relief valve is damaged, then oil will pass more freely in the engine, and that will reduce pressure.
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