Compression Ignition Addict
Join Date: Aug 2008
Location: Central Texas
Thanked 20 Times in 19 Posts
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I ran the Shell Rotella T5 since it came out, and when I brought my truck new I switched to 10w30 my first oil change and never looked back. The past two oil changes, I've run the Amsoil ACD 10w30 diesel synthetic...I picked up 1.2 mpg when I first switched from Motorcraft 15w40 to the 10w30. I picked up .3 mpg when I went from the T5 to the Amsoil ACD 10w30...and can go 660 miles to a full tank (29 gallons)...i'm a 23.4 mpg on the highway, at no more than 2000rpm..I've done EVERYTHING I can to get 24mpg, and it just won't happen lol.
I've always been a fan of decreasing parasitic drivetrain loses and increasing fuel mileage.
I would run 10w30 without hesitation (and I've towed with the Amsoil ACD)...if you tow heavy constantly in the summer, 5w40 or 15w40 synthetic may be the better choice.
'07 F-250 PSD 4x4
. S&B, 5" exhaust, zoodad, blue spring, '03 Turbo, 6.4 starter, 2.5 f/coils, adj Trac bar, 2" r/add-a-leafs, egr delete, DC 185 alt, Procomp shocks, SCT SF3 tuner, F-Detroit Truetrac, R-Detroit Locker, 4:10 gears, LT315/70r17 Duratracs, Amsoil Gear lube, Amsoil FE ATF, Delo 400 LE 5w30 diesel, Delo ELC, archoil 9100/ar6200, bpd ficm, arp studs, oem gaskets, HD water pump, stc, plugs, stand pipes, 6.4 banjo bolts, monitor, new oil cooler, coolant filter