Oil change and other changes

[Gunner]

Originally Posted by patrickt

But I'd double check the calibration of your dip stick. An oil change with your set up that takes 9 quarts or more is suspect.

*shrug*. I'm assuming the stick is correct - it was showing low in the SAFE range since I've had it and had not changed measurably in 500+ miles. Never any of the signs of low or high oil level.

Unless I'm grossly misreading things, I'm only about a quart-minus over, so yes, it took 10 quarts. I'll measure off a quart tomorrow and see. I was in a hurry and should have given it a few more minutes before adding that last quart.

Red, I appreciate the concern but I don't see any sign of oil pressure problems. I don't think I've ever had a motor that pushed 40psi at 800-900 idle, hot. Maybe 30. A steady 20-22 is what I've seen as typical. Pressure jumps straight to 60 (hot) by 2500 RPM and stays there, dropping only about 10 psi from the cold max of 70 or so. I don't, and never have run high-pressure pumps, though. This is a near-OEM spec Melling. Remember, I have a fairly mild mill in 707.

[madmaxx]

Your oil pressure is perfect. Lighter weight oil is better, stick with the 10w30. Oil pressure is just that, it is not flowrate. If you had oil pressure of 500 psig and 10 psig the flowrate would be identicle. Your oil pump is a positive displacement pump. It is the small bearing clearances that generate the back pressure on the pump. I have had a boat for 15 years with 6psig at idle and beat the sheet out of it, runs perfect after 3000 hours of abuse.

Originally Posted by Gunner

*shrug*. I'm assuming the stick is correct - it was showing low in the SAFE range since I've had it and had not changed measurably in 500+ miles. Never any of the signs of low or high oil level.

Unless I'm grossly misreading things, I'm only about a quart-minus over, so yes, it took 10 quarts. I'll measure off a quart tomorrow and see. I was in a hurry and should have given it a few more minutes before adding that last quart.

Red, I appreciate the concern but I don't see any sign of oil pressure problems. I don't think I've ever had a motor that pushed 40psi at 800-900 idle, hot. Maybe 30. A steady 20-22 is what I've seen as typical. Pressure jumps straight to 60 (hot) by 2500 RPM and stays there, dropping only about 10 psi from the cold max of 70 or so. I don't, and never have run high-pressure pumps, though. This is a near-OEM spec Melling. Remember, I have a fairly mild mill in 707.