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Old 01-21-2013, 01:04 AM   #9 (permalink)
Join Date: Jul 2012
Location: goode, va
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no worries - '91 Subaru legacy L
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Originally Posted by UFO View Post
Temperatures have been near zero Fahrenheit for the last week or so. I drove my gasser pickup this morning because I still have some biodiesel in my VW tank that gelled last month and is still giving me an occasional issue.

Before the truck was warm, in the cold the difference in coasting speeds was shocking. I was slowing to a stop well in advance of lights, where before I was having to brake slightly. I guess the axle grease takes a while to lose it's friction.
This is interesting because on most vehicles, there is no oil cooler, no cooler for differential, and for manual trannys, no cooler there. By the same token there is no preheater for them either. With ambient temp differentials approaching a 100 degrees f between summer and winter in many parts of the usa, its a wonder mileage doesnt change more than it does. Here in central va i give up between 10 and 20% during the winter due to the above factors, not to mention the fact that winter fuel is more volatile and a gallon of winter gas wont go as far as a gallon of summer gas.

I would think a water jacket on each driveline component connected to the cooling system woul pay significant benefits in colder climates, especially with a coolant heater and circulating pump that you could plug in inside your garage

In the summer it would help keep temperatures at coolant temp and extend the driveline components life.
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