Tom Buese wrote:
> Is that a reason why I get worse gas mileage in the winter?

That shouldn't be much of a factor if the thermostat is working
correctly, Tom.  Once the engine is warmed up, it doesn't even know it's
winter.  That's why I use 5W 50 when it's really cold out.  When I first
start up (cold engine) it thinks the oil is about 5 weight and when it
gets up to operating temperature, it thinks it's about 50 weight.

Mike