Oil change. Synthetic?

[clashem360]

I'm about to finally change my oil and I was wondering what kind if oil you guys use? I don't Wana go with the stuff with all those commercials just cause they have a commercial I want one that is proven by people who use them

And should I switch to synthetic? Half synthetic blend?

I know kinda a stupid question but Wana make sure this baby has everything perfect

[digicam_obs]

i just started running the rotella synthetic 5w-40 it was recomended to me by a mechanic friend who swears by it! he said anywhere from 9000-13000 miles before a change. i like it so far, been little over 2000 mles. i want to take a sample at 3000 mi and get it tested to make sure it's good to keep running. i'm curious too what others use!

[Ozonkiller]

Oh boy, here we go with another oil thread.

My 2 cents. I switched to Amsoil strictly for the benefit of going longer between changes. Surprisingly, I gained right at 1 mpg.

Conventional oil change cost, around $65 @ 5000 miles
Amsoil oil change $154 @ 10,000 miles

Fuel savings with 1 mpg gain over 10,000 miles around $160

At 10,000 miles, I'll send off a sample to see how it's holding up. Cost $25.

That's my plan. Other's plans and results may vary...

Tom

[Hendricksbus]

i also use the T-6 5w-40.. love it in the winter time..still woundering if i should run it during the summer with heat these things make? i tow rarely, mainly a DD.

[madpogue]

Originally Posted by Hendricksbus

i also use the T-6 5w-40.. love it in the winter time..still woundering if i should run it during the summer with heat these things make? i tow rarely, mainly a DD.

Why wouldn't you run it in the summer? Our trucks actually run fairly cool compared to most other diesels; you shouldn't need any xW50, esp. in Wisconsin. Folks are running xW40 in places a lot hotter than this.

Last summer I changed the oil in the ECLB, Rotella-T syn 5w40, after aprx. 7500 miles. Part of that was two trips over the Smokies (WI-FL and back). Don't have the UOA in front of me, but it came back pretty good; no concerns.

[1996powerst0ke]

What's an advantage of running 5w40? I'm running 15w40


Sent from my Autoguide iPod touch app

[backwoodsboy]

Better cold-start at low temperatures.
I run Delo 15w40, changed every 4500 with no issues.

[Turbostang500]

Originally Posted by Hendricksbus

i also use the T-6 5w-40.. love it in the winter time..still woundering if i should run it during the summer with heat these things make? i tow rarely, mainly a DD.

The first number is the weight of the oil at 32°F.
the second number is the weight at operating temp.

A 5w40 and 15w40 oil has the exact same viscosity at operating temp.
the 5w40 is lighter in colder temps which allows easier, quicker starts
as stated above.

There are a lot more differences between dyno oil and synthetic.
i invite you to do some searching on this subject.

I just went to t6 rotella so i have some driving to do before i see how it works out.

[Fordman247365]

I just cant bring myself to do a $150 oil change LOL
Subbed to see oil results at 9000 miles.

[1Dieselman]

I switched to the rotella 5w40 about six years ago mainly because I usually don't put more than 3000 miles on the truck per year so I want the extra protection that the synthetic has because of how long the truck may sit between uses. When I do use it the temps may be 15* in the winter or 110* in the summer only drive a few miles or may be hooking a trailer and going 400 miles and I'm confident the synthetic can handle whatever is thrown at it. I change oil at 7500 miles and costs right at $95.