# Informative compression test info from my own car.

**URL:** <https://forums.speedlife.net/t/informative-compression-test-info-from-my-own-car/259128>\
**Category:** Shift518 Automotive\
**Created:** [June 27, 2011, 4:50pm UTC](https://forums.speedlife.net/t/informative-compression-test-info-from-my-own-car/259128 "2011-06-27T16:50:00Z")\
**Posts on this page:** 1\
**Showing post:** 77

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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:** [June 28, 2011, 10:05am UTC](https://forums.speedlife.net/t/informative-compression-test-info-from-my-own-car/259128/77 "2011-06-28T10:05:14Z")

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> [@WTB: mazda 3](https://forums.speedlife.net/t/wtb-mazda-3/43380/14):
>
> Trav i got nothing aganist you but just face it, the motor has 15psi less compression in that one cylinder. Why does that onc cyl need more oil temp to have the same compression as the others, why does the other 3 have perfect compression with lower oil temps. If all 4 compression numbers went up with higher oil temps id agree with you but it doesnt. Does it smoke, burn oil, have lotta blow by? If not, who cares beat that sob

Maybe that particular cylinder on the 4g63 is the last to get up to temp due to the oil/cooling system design. Maybe it’s the thick oil. Who knows. The engine compression tests PERFECT when up to OPERATING TEMP, so that’s literally all that matters.

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