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Old 10-24-2019, 07:45 AM   #23
City: Rochester, NY
Country: USA
Vessel Name: Hour Glass
Vessel Model: Chris Craft Catalina 381
Join Date: Aug 2019
Posts: 785
Originally Posted by FF View Post
The hassle with the 250w magnetic oil pan heaters is long term the constant heat in one spot burns the oil into carbon chunks.

Most converted coach owners will use them in an emergency , but install in block coolant heaters for long term good winter starting.
Depends on the pad size and how well the heat gets distributed into the oil. If any spot on the oil pan inner surface is getting too hot, this can definitely happen. Synthetic oil will survive a higher temperature before this happens.

That's part of why I'm a fan of coolant heaters, but using a smaller oil pan heater so the oil isn't stone cold at startup (having both coolant and oil pre-warmed means you can load the engine up more right after startup).
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