A few years ago there was a UOA done on I believe a Chevy Caprice with 5.0L using either 5W or 10W 30. The OCI was very extended and the results were off the charts good and people questioned if the TBN was correct because it was still so high. The oil was from Texas Refinery
http://www.texasrefinery.com
and the oil was:
http://www.texasrefinery.com/assets/pro-spec-multi-viscosity-synthetic-blend.pdf
I talked to a very nice lady at Texas Refinery back then and she was very polite but also very matter of fact in stating that you can not put a better oil in your vehicle at any price. I very much wanted to try this oil, and still do, but you have to purchase in lots of either 24 or 48 quart quantity so I never pulled the trigger.
This is certainly something you are not going to see in many home garages. I wish I could find the UOA aforementioned.
http://www.texasrefinery.com
and the oil was:
http://www.texasrefinery.com/assets/pro-spec-multi-viscosity-synthetic-blend.pdf
I talked to a very nice lady at Texas Refinery back then and she was very polite but also very matter of fact in stating that you can not put a better oil in your vehicle at any price. I very much wanted to try this oil, and still do, but you have to purchase in lots of either 24 or 48 quart quantity so I never pulled the trigger.
This is certainly something you are not going to see in many home garages. I wish I could find the UOA aforementioned.