5w20 in a 4.0 v6, should I dump it?

Last night while I was changing my oil, after I had dumped my old oil already I realized I had gotten 5w20 instead of 5w30 for my 4.0 v6. Will I be fine running this for about 4k or should I switch it out now?

 

I'd dump it and put 5W30 back in.Unless you're running in cold weather all the time.

 

Won't hurt anything.

 

I agree..it wont hurt

 

Shit, sell the truck.

 

^ I was scared I was going to have to before I read these post, glad I dont have to now
seriously though I knew it wouldnt destroy it I was just wondering if it was best to switch it out, I always want the best for my baby.

 

Your baby won't even know the difference, especially this time of year.

 

haha ok good, thank you

 

ya dont waste your time and money on changing out the oil again, as long as there's oil in it then different viscosity wont hurt. but you do want to try make sure you do put the right viscosity according to manufacturers spec for next time

 

0-30.....better

 

Leave it, nothing will happen

 

I might be concerned if I were going to load the truck down and tow with it. Otherwise, no, not something I'd worry about.

 

I'm just curious... What's your reasoning behind this?

 

If you're working the engine really hard such that temp goes higher than normal for extended periods the oil can thin out more than usual. That's most likely to happen pulling loads in summer over mountains. 5w30 or even 40 provides margin for that long pull up a 6% grade with 5000 lb of box trailer in back.

5W20 SM and especially SN oils are super stable, though, so occasional or short pulls won't be a problem.

 

I use 5w20 Moble one and it is great

 

Wouldn't worry about it, especially if you used synthetic.

 

Won't make a difference, unless you are seriously abusing the truck.

 

Buddywh1 pretty much covered it. Lower viscosity oil is less able to protect against wear, especially in splash-lubricated areas like piston ring/cylinder wall and some valvetrain components of some engines. Add in high heat loads from heavy duty use, and the thin oil gets even thinner. I'd rather have approved viscosity oil for an engine under heavy duty use.

 

Just to make sure I'm clear... 5w20 is fully approved and doubtless would work OK even then. I just agree that pushing it really hard the extra margin is nice to have.

But when the vacation hauling a 20ft travel trailer across the southwest is over I'm going back to 5w20 to get whatever mpg improvement it will give me. However small it may be: it all adds up!

 

I run 0-20 syn.
You will be fine.