The subaru 4EAT's are completely interchangeable, across models and years. The automatic outback's came with 4.444 and I think you can go as low as 3.7, but probably more like 3.9. That's as low as it goes for subies, how much of a difference would that make at interstate speed?
Zero: You might want to try a block heater. I finally figured out how to install a circulating one on our cars. Having the car already at full operating temperature before I leave is very very nice. It's not even that cold yet and I want to kick myself every time I forget to plug it in.
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