# 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:** 24

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**Author:** ![98PAITR](https://avatars.discourse-cdn.com/v4/letter/9/35a633/32.png) [@98PAITR](https://forums.speedlife.net/u/98PAITR)\
**Post date:** [August 11, 2007, 10:29am UTC](https://forums.speedlife.net/t/0w40-oil/191649/24 "2007-08-11T10:29:19Z")

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> [@Working peeps 07/04/2007](https://forums.speedlife.net/t/working-peeps-07-04-2007/31846/7):
>
> The purpose of synth is to go longer between changes, doesn’t matter if the car came with it from the factory or not, if you use synth and change it every 3K miles your wasting money, but you can run synth up to 10K and 20K miles, best way to see what your oil is doing is to send it to a lab (Blackstone Laboratories) I’m running the 25K Amsoil and getting it tested around 10K…

That’s not completely true. Synthetic oil has additives in it to reduce friction and disperse heat. It also does not break down as fast under hard driving. I would never trust any oil in my car for 10k or 20k.

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