Join Date: Nov 2009
Location: Minot, ND
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I use a Cenex 5W-40 available locally for about $15/gallon. But again, since 5W-40 is so loaded down with conditioners, I don't trust it past 5000 miles. The difference, especially up here in ND where air temps dip below -30F, is night and day.
Since my oil is black at 5000 miles anyway, I use the cheapest 15W-40 I can find in the summer. I don't need anything that lasts longer than that.
5W-40 is better than 15W-40 in any temperature from -100 to 250F due to a flatter viscosity curve, but you will be sacrificing some oil life meaning that it will lose its SAE40 protection while warm sooner than the 15W will.
01 PSD CC 4x4 F-250
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04 YFZ-450, WR Crank, 13.5:1 piston, Ron Woods Racing head, Crower cams, Programable ignition, Jet kit, Fuel/K/N intake, Ron Woods exhaust, Hinson clutch, worn out 06 suspension, more.