# 0w40 oil?

**URL:** https://forums.speedlife.net/t/0w40-oil/191649
**Category:** PittSpeed Automotive
**Created:** [August 7, 2007, 12:32pm UTC](https://forums.speedlife.net/t/0w40-oil/191649 "2007-08-07T12:32:14Z")
**Posts on this page:** 1
**Showing post:** 13

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### Author: ![xlogic](https://avatars.discourse-cdn.com/v4/letter/x/59ef9b/32.png) [@xlogic](https://forums.speedlife.net/u/xlogic)
#### Post date: [August 8, 2007, 9:10am UTC](https://forums.speedlife.net/t/0w40-oil/191649/13 "2007-08-08T09:10:49Z")

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> [@Snapped some pics of Final GTS' viper.](https://forums.speedlife.net/t/snapped-some-pics-of-final-gts-viper/31789/17):
>
> that isn’t necessarily true. Older seals and stuff will swell differently in synthetic than in dino oil, so you may have leakage issues. I wouldn’t make a blanket statment like that though.

even when switching isn’t there a “breakin” process where you don’t just jump to synthetic completely?

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