I have a 610 up here in Minnesota and have been good about keeping a trickle charger on the battery to help it get started on cold winter mornings. I thought warming the oil would make it even easier to get past its sluggish cold weather starting. Anyone had experience with a dipstick heater to keep the oil warm? I don't have easy access to the oil pan afor a magnetic heater and she's air cooled so a block heater isn't an option. Are there other options available that I'm not aware of? Steve