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Thanks for the reply Grumpy!
The guy told me specifically it was a red fluid.
And I don't know exactly where the block heater is installed. I always thought it was a heating element that attaches to the block and heats things via conduction.
Do some block heaters actually penetrate the block and have a heating element in the oil/fluid/whatever?
Will need to see what it is once I get it in for service.
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