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Friend of mine just bought there first 52 with the Cummings in it. They did a service (fuel,oil, air 15w-40) oil pressure reads 9 to 10 pounds at idle 60 pounds at full throttle is this normal.
 

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Thats on the low side for that 8.3 cummins. Normal is in the 25-30 range. On the other hand it could be a bad gauge. Usually when you are on the low side of the oil pressure you cannot achieve 60lbs at full throttle.
 

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Change the gauge ;)

The engine shuts down under 12 psi if I recall... Have had that happen where the gauge shows fine at high pressures but shows low at lower pressures.
 
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