OP
sideskraft
Silver Member
PA, the additive is Power Service Diesel 911, which actually came with the tractor. Based on the bottle's recommended dosage, it's likely the same product that's in the "standard" PS additive, just with a different label. I'm sure what's left in the bottle (90%) will last me several years. The primary function of this and similar products is to prevent "gelling" of the fuel, but it sounds like your F350 may have other issues unrelated to gelling that are causing hard starting. I drained the engine oil tonight, which is the first time for this machine (boy were those drain plugs tight). The manual said the factory fill is 15W40 and I believe it -- it was really thick, even though it was 23 degrees. I'm putting in 5W40 synthetic which should make a huge difference in how it starts and gets the oil circulating through the engine when it's cold.