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For your area I'd think the SAE 15W-40 Heavy-Duty Diesel and Marine Motor Oil would work well if you stick with Amsoil. Those low temps are not that bad. It's cheaper than the series 3000 HDD oil by about $6.00/gallon. The HDD series 3000 oil is supposed to give better mileage though.
I'm running the 5-30 in mine now, I like the way it runs with it, mileage is good too.
I've been running Amsoil for 2 years now and like how it works in my truck, much better cold starts from when I had the 15-40 Rotella in it, runs smoother and quieter too.
You can't go wrong running it, that's for sure. Make sure to get it analyzed periodically. I sent mine in with about 7000 miles on it and it came back with great results, all numbers were well within the ranges they should be.
99 F350 Crew Cab Long Box 4X4
311 k and
PHP Phoenix - 5 positions
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