Oil Pump Question - **

[Plimbob]

I am going to replace the oil pump and o-ring on my 07 (300k) and wondered about the high output oil pump option considering mileage.

Any experience with those?

Thanks,
Tim

 

[wsteele]

I am going to replace the oil pump and o-ring on my 07 (300k) and wondered about the high output oil pump option considering mileage.

Any experience with those?

Thanks,
Tim

If it were me, I would follow Melling's advice and go with the M295HV (recommendation by them for high mileage engines), cause they know more about this stuff than me.

 

[iamdub]

I am going to replace the oil pump and o-ring on my 07 (300k) and wondered about the high output oil pump option considering mileage.

Any experience with those?

Thanks,
Tim

The factory pump is a "high volume" pump compared to the non-AFM LS engines. If your current pressures are good, then you don't need to go crazy with an overly high output pump as this would just put undue stress on the aged system. Go with what Melling recommends. Don't forget the new timing set (at least the chain) and tensioner.

 

[Plimbob]

Thanks guys - appreciate the input! I'll change the chain and tensioner while i am in there. The oil pressure has been dropping over the last several months. it used to be about 25-30 at idle and 40-50 at 1500 rpm. now its, 20 at idle and 35-38 at 1500. I assume the pick up seal is weak and proabably the pump as well considering it has 300k on it. I changed out the pressure sensor and the screen was clean and didn't change the pressure reading much, maybe a little higher with the new sensor.

 

[CaptainAmerica1]

You change the screen or just check it?

 

[swathdiver]

I am going to replace the oil pump and o-ring on my 07 (300k) and wondered about the high output oil pump option considering mileage.

Any experience with those?

Thanks,
Tim

Your original pump was the M295 or M355. I reckon that your truck has an iron block LY5 or LMG. The aluminum block motors got the M365 which pumps 1/3 more volume per revolution and runs at a lower pressure.

Required reading:

https://www.enginebuildermag.com/wp-content/uploads/Articles/03_01_2012/986163348GMGENI_00000054947.pdf