Oil Viscosity??
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Senior User
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Oil Viscosity??
Hey guys
Gonna change the oil in my f350 dump truck, should i use the 5w40 recommended for heavy duty use? tow a bobcat a few times a month as well as a dump trailer, and obviously use it as a dump truck often, but i still think the truck has an easy life as far as dump trucks go. i don't work it too hard but if i should use the heavy oil then i will.
thanks
Gonna change the oil in my f350 dump truck, should i use the 5w40 recommended for heavy duty use? tow a bobcat a few times a month as well as a dump trailer, and obviously use it as a dump truck often, but i still think the truck has an easy life as far as dump trucks go. i don't work it too hard but if i should use the heavy oil then i will.
thanks
Super Moderator
Joined: Aug 2008
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From: Frederick, MD
Read the owners manual. It will indicate the viscosity of the oil you should use according to the temps.
I think you will be fine myself.
Also did your truck come with the engine block heater?
I think you will be fine myself.
Also did your truck come with the engine block heater?
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Senior User
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yeah it has the engine block heater, as if it needs it the glow plugs are amazingly fast. the only reason i use it is for instant heat
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From: Isanti, MN
Either oil will do fine for your use. Most dealers don't have the owner fill out a questionnaire before they do an oil change, they just put the factory recommended 10w30 in.
I'd use 10w30 if I were you and switch to 5w40 for the winter.
I'd use 10w30 if I were you and switch to 5w40 for the winter.
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Super Moderator
Joined: Aug 2003
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From: Isanti, MN
But a little more expensive and for little gain during the summer time. The big issue is cold starting during the winter, and that's where having a thinner synthetic oil would really pay off. Lots of talk about thicker oils for high ambient temperatures, but I agave yet to see a bad UOA with factory specified oil.
Post Fiend
Joined: Jan 2009
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From: Greenwood, SC
The beauty of that 5w/40 synthetic. It is especially valuable to all you northerners in my opinion. It's like super slick water at 70° and up. Your cold weather performance is only a big deal when you first start it, right?
I think the T6 would be a great choice and it's cheaper than the Motorcraft.
Unless there's been a change, I remember the Motorcraft being almost $10 more/gal than the shell.
I think the T6 would be a great choice and it's cheaper than the Motorcraft.
Unless there's been a change, I remember the Motorcraft being almost $10 more/gal than the shell.
Prolocutor
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From: Western MA
That's what I was thinking but couldn't argue price with mod Tom as I've never considered 10/30 so never priced it...
Super Moderator
Joined: Aug 2003
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From: Isanti, MN
Yeah, I haven't looked in a year or so but I believe it can be had for around $15-16/gal for T5 synthetic blend. That's about $15 less for an oil change. 
Who...me?
Who...me?