[ZX-10R]

Originally Posted by hawk02

You can all call me crazy, but I noticed a subtle improvement in my car's performance immediately upon changing to the 0W 40 weight oil. My car had a bit more pep and smoother acceleration.

https://www.mobil.com/en/lubricants/...il-1-fs-0w-40/

https://www.mobil.com/en/lubricants/...mobil-1-5w-30/

You can see the differences are minor, 0W-40 is slightly higher viscosity so it may use less oil, especially a higher mileage engine. Hopefully you have a catch can installed because gas dilution trashes oil viscosity quickly

From what I understand the oil pump failures are all because the oil pump gear is cheap pot metal and gets stress cracks, then fails completely over time. A slightly higher oil viscosity would not help

[Mark R]

At the risk of being mocked, I opened up the old oil pump, and it was perfect on the inside. No stress cracks or anything amiss.

I'm really happy I did it anyway. I have a couple of trips planned for next year, and this really takes away any doubts about the reliability of the car.

[ZX-10R]

How about a few pictures of the gear, etc?

[Mark R]

Originally Posted by ZX-10R

How about a few pictures of the gear, etc?

Here you go. The internal rotor seems like pretty high quality material. It does not look like it would break.

[ZX-10R]

Originally Posted by Mark R

Here you go. The internal rotor seems like pretty high quality material. It does not look like it would break.

Thanks - and agree, who would have thought GM oil pumps, especially in this engine, would fail?

[ZL1plumbin]

Originally Posted by Mark R

Here you go. The internal rotor seems like pretty high quality material. It does not look like it would break.

Is that the stock one or the Katech unit?

[Mark R]

Originally Posted by ZL1plumbin

Is that the stock one or the Katech unit?

Stock.

[Choda]

I upgraded to the TRUCK Katech pump because it was supposed to have higher PSI.

Did any of you change anything in your Tunes after installing the Katech pump?

My oil pressure seems a bit funky to me in all my logs. My main bearings have additional clearance and I also feed the turbo at the same port where the oil pressure sensor is. I modified the valley cover to work with my build. Seems to max out around 50psi. Looking at my old logs with the oem bearings and oem pump but same turbo feed, max oil psi was 55 psi.

[ZX-10R]

Originally Posted by Choda

I upgraded to the TRUCK Katech pump because it was supposed to have higher PSI.

Higher pressure for the sake of higher pressure isn't a good idea, you want to run their pump actually designed for the LT4 wet sump engine
https://shop.katechengines.com/produ...sump-oil-pump/