# Putting Mobil 1 Extended Performance to the test...

**URL:** <https://forums.speedlife.net/t/putting-mobil-1-extended-performance-to-the-test/261494>\
**Category:** Shift518 Automotive\
**Created:** [November 27, 2011, 3:13pm UTC](https://forums.speedlife.net/t/putting-mobil-1-extended-performance-to-the-test/261494 "2011-11-27T15:13:57Z")\
**Posts on this page:** 1\
**Showing post:** 30

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**Author:** ![KillerBlackbird](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/killerblackbird/32/6525_2.png) [@KillerBlackbird](https://forums.speedlife.net/u/KillerBlackbird)\
**Post date:** [November 28, 2011, 4:22am UTC](https://forums.speedlife.net/t/putting-mobil-1-extended-performance-to-the-test/261494/30 "2011-11-28T04:22:11Z")

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> [@Another reason to HATE Boston.....](https://forums.speedlife.net/t/another-reason-to-hate-boston/46837/24):
>
> Is this going to zero on the OLM?

I go to about 15% as the lowest. Usually I change around 20% +/-. Its definitely black when I change it lol, but I think Amsoil guarantees it to 25K under “normal” service and 15K under severe.

I used the same oil in my STi with an Amsoil Maximum Efficiency oil filter and I never had an issue with oil consumption. I changed that every 6K due to fear of potential issues with the rings and lack of OLM.

Heres one study Consumer Reports did on synthetic oils: [http://www.ganoa.org/Motor\_oil2.htm](http://www.ganoa.org/Motor_oil2.htm)

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