I would hit your engine builder with that question,
All the GM motors that came back from our rebuilder had the 5/w30 crossed off and 10/w30 written on the oil cap.

 

Yes, i hear alot that this 5w20 we use is the biggest reason for failure of the oil pump

 

I would like to see some number of how many oil pumps in these engines have ever failed for ANY reason. I think you're misinformed.

 

If you google 5.4 oil pump failure ...................

 

I did and have many times. They all lead back to other problems (blown tensioner seals, broken chain guides, improper oil, OCI, improper oil filter) that are not due to a failed oil pump. As a matter of fact I have a hard time finding any that were an actual oil pump failure. Every one leads back to a problem not caused by an oil pump failure. How about we flip the script here and have someone show me a time where the oil pump was actually the point of failure....?

 

http://www.jasperengines.com/blog/fo...il-pump-update

 

Ok, thank you for posting that. Most people on here dispute this as do I, regardless I'm not going to get into a debate on the OPs thread so we don't get off topic. Also I should have clarified a better article would be one where the creator of the article is not selling their product. When bias is involved I do not trust an internet article. Everyone on the internet states their product is better and can do many things to make this appear true. Although I did have my oil pump swapped with a Melling 10340 when my timing was done, simply for the reason of replacing an oil pump with 130k on it (I also had the water pump replaced) I still think the OEM oil pump is fully capable of running the system without any problems or failures.