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Old 10-07-2011, 02:59 PM   #16
italy wrx
Scooby Specialist
Member#: 36450
Join Date: May 2003
Chapter/Region: SWIC
2003 WRX


The new Prius will throw misfire codes if 0w20 synthetic is not used.. Engineers at Toyota said it has to do with the calibration of the crank and cam sensors. Thicker oil causes the rotating assembly to spin at a slightly slower speed which is interpreted by the ecu as a misfire.. Sounded ridiculous to me...
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