# Ruh roh...

**URL:** <https://forums.speedlife.net/t/ruh-roh/244232>\
**Category:** Shift518 Automotive\
**Created:** [May 18, 2009, 9:44pm UTC](https://forums.speedlife.net/t/ruh-roh/244232 "2009-05-18T21:44:22Z")\
**Posts on this page:** 1\
**Showing post:** 67

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**Author:** ![TurboTravis](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/turbotravis/32/6406_2.png) [@TurboTravis](https://forums.speedlife.net/u/TurboTravis)\
**Post date:** [May 21, 2009, 6:04pm UTC](https://forums.speedlife.net/t/ruh-roh/244232/67 "2009-05-21T18:04:59Z")

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> [@new here slight\_smile](https://forums.speedlife.net/t/new-here/17903/17):
>
> Use methanol are a backup with slight increases in timing and you’re fine. Using it as a pure performance gain and there’s always a chance something can fail. I typically use it more for the cooling affect, rather than the increase in octane it offers(allowing increase timing adavnce).
> 
> VP M-1 floats around $40 for five gallons. I’ll typically run 3:1 meth/water ratio for street cars. Most systems can’t handle much more of a concentration than that without part degredation over time.

The main concern is pump degradation. Most manufacturers will recommend rebuilding/replacing it every 2-3 years.

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