Compression Ignition Addict
Join Date: Oct 2006
Location: Walpole, MA
Thanked 22 Times in 21 Posts
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I was having the same problem as you in Pa it never wanted to start in the cold. I switched to synthetic oil 5w-40 and i swear it starts like a new truck i don't even have to plug it in ever.
5w-40 will help but at 40 degrees a properly functioning 7.3 should have NO problem starting with 15w-40 in the engine. Light weight oil helps but it is not a cure all...
2002 F-350 4X4 ECLB 7.3 4R100 6637 filter w/ RiffRaff cover, 08 diff cover, 203* T-stat, HPX, Stancor Relay, 6.0 trans cooler, Zone leveling kit, 8'6" Western Ultramount
Sold: 04.5 Dodge Ram 2500 5.9 CTD, Reg Cab, 48re