What Viscosity Oil do you use?

[Raptor22]

What viscosity oil do you use in your truck?

 

[F 150Cobra]

in my old truck i used to use 40 HD or 50 HD

in my new engine im gonna use 10-30

 

[Blue Goose]

In my truck, I use Shell Rotella synthetic 5w40 so I had to vote other...

 

[91xltlariat]

10w40 in summer, 10w30 in winter.

 

[LEB Ben]

I use several...after a fresh rebuild 15w40 Rotella. After about 15000 miles, MotorCraft 10w40, and when the oil is blowing outta the tail pipes or starts leaking...20w50.

 

[john112deere]

10W-30

That's what the guy I got it from used for 200k miles. One day I happened to read that the Ford spec for that engine is 5W-30...tried it the next change, and drained it out after about 30 miles. My lifters didn't like it, and complained audibly.

 

[1985 Ford F-150]

I go 15w40 as well. Its mostly for breakin in the motors but I like the oil pressure it gives me so I use it all the time.

 

[Skandocious]

Castrol GTX 10w30

 

[89frankenford]

Kendall GT-1 Synthetic 5w-30 and Mobil 1 Synthetic 5w-30

 

[F 150Cobra]

Castrol GTX 10w30

thats what im gonna use

 

[LEB Ben]

The first oil change I did on the Bronco, all we had on the shelf was some 10w30 for my bro's jeep...well I used it, just to get some fresh oil in there. Well...I'm pretty sure it was so thin that the engine didn't even bother to blow smoke out the pipes...it just blew straight fluid...haha. Obviously an exagerration...but you get the point.

 

[UNRULEE]

I use 5-40 Rotella Syn in the PSD.

For the '79 it's Rotella 15/40 in the summer and Rotella 10/30 once it gets cold.

 

[Raptor22]

I use Castrol GTX 20W50 in the truck because it never gets that cold here and the thicker oil lubricates better IMHO. Probably why it still had hone marks in the cylinders at 145,000 miles... practically zero wear.

 

[Skandocious]

I use Castrol GTX 20W50 in the truck because it never gets that cold here and the thicker oil lubricates better IMHO. Probably why it still had hone marks in the cylinders at 145,000 miles... practically zero wear.

It also adds stress to the engine if the heavier oil is not needed... Thing about eating peanut butter and trying to smack your tongue against the roof of your mouth, versus doing the same with water. You gotta work harder to overcome the higher viscosity of the peanut butter.

A crude analogy-- maybe. But similar principles apply.

 

[CowboyBilly9Mile]

I use Castrol GTX 20W50 in the truck because it never gets that cold here and the thicker oil lubricates better IMHO. Probably why it still had hone marks in the cylinders at 145,000 miles... practically zero wear.

Where were the hone marks at? Top or bottom of the bore and were they on the sides of the cylinder closest to the wrist pin or the sides closest to the piston skirts?

 

[SuperCab]

10w-30 SuperTech Synthetic.

You can't see the smoke with synthetic...

 

[CowboyBilly9Mile]

Where were the hone marks at? Top or bottom of the bore and were they on the sides of the cylinder closest to the wrist pin or the sides closest to the piston skirts?

Bump.

Conner, you were on 45 minutes ago this evening ..................

 

[Beachbumcook]

Hey... you guys left out us diesel truck owners in the poll!!!

There was no option for 15W-40 or 5W-40 rated oils!!!

So... I choose "other".

Don't upset the band of diesel merry men... we are a mean bunch of beer drinking drunks!!!!

 

[mrxlh]

15W40 so voted other.

 

[montana_highboy]

Shell Rotella T 15w40 and Wix filters