<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Steady Eddie:
"...I have owned three of them..."
Me, too, and all three carried lots of oil pressure.
"...Anymore than this and you are risking washing the engine bearings, and blowing out various seals within the engine..."
I think that bearings can be "washed" with
coolant that some how got into the crankcase,
but in this case, they are being bathed in oil,
no problems. It IS an issue with the case on
the spin-on oil flter (the can) and that can be avoided by using a known filter of good quality,
like a NAPA/Wix, which will handle LOTS of PSI.
The engine's seals are OK.
The differences in reported oil pressures are
directly related to the weight of oil being used. Over on the Forum: The Diesel Place, there
are 8.1 Owners reporting 70 PSI at road speed and 40 PSI at hot idle with the 8.1L.
But they are NOT using 5W-30 wt. oil. </div></BLOCKQUOTE>
Eddie, oil pump pressure regulator/relief valves work with 15W50 as well as with 5W30. The oil pump even at 3000 RPM will bypass pressure thru this valve, unless of course it has been equipped with a heavier spring or had the original shimmed up. Bearing wash has nothing to do with coolant in crankcase. It is about oil supply being supplied at too great a pressure to adhere to the crank surfaces of an engine. If you are happy with 70lbs pressure, well thats all that counts. I think you are wise to use a quality filter, as start up oil pressure with 50 wt oil could really be a problem.