The normal drain interval for transaxle oil is 60k miles per Toyota. However, we've found it needs to be closer to 30k miles. Your mileage may vary.
In my case, I was looking to see if this second pan heater would last more than a year ... no. So I'm thinking 'outside the box' for another solution ... a Prius docking station at home.
As for coking the oil, that is why I'm interested in a steam heating solution. The temperature will never exceed 100C so the oil will be 'safe.'
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
Last edited by bwilson4web; 01-22-2010 at 03:00 PM..
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