is there any reason anyone ca think of that a dealership would put 5w-30 in my duramax?

thanx

No.

by mistake or maybe a non diesel oil.

i've heard of 10-30 Amsoil heavy duty diesel oil but i'm sure they werent using Amsoil...probably a 7 dollar an hour oil change jockey that doesnt care

They forgot it was a dismal...??

probably a 7 dollar an hour oil change jockey that doesnt care

x2, dude thought "New style GM truck...5w30!"

Someone had a "brain fart". I would go back and ask the dealership and have them correct.

Moved over to the fluids section.

A gasoline engine combustion cycle is a "burn" process. In a diesel application the process is a literal "explosion". A violent affair which puts explosive forces on the connecting rod bearings. One of the major functions of an engine oil lubricant is cushioning. In a diesel engine one of the single life extending advances in the past 20 years was the transition from 30 to 15W-40.. I nearly doubled diesel engine bearing life!
So, in a word, NO, not ever, a 30W in a diesel engine. We need that 40W film thickness to provide that cushioning...
George Morrison, STLE CLS

A gasoline engine combustion cycle is a "burn" process. In a diesel application the process is a literal "explosion". A violent affair which puts explosive forces on the connecting rod bearings. One of the major functions of an engine oil lubricant is cushioning. In a diesel engine one of the single life extending advances in the past 20 years was the transition from 30 to 15W-40.. I nearly doubled diesel engine bearing life!
So, in a word, NO, not ever, a 30W in a diesel engine. We need that 40W film thickness to provide that cushioning...
George Morrison, STLE CLS

Many people have had no problems at all using amsoil's 5w30 HDD diesel motor oil. In fact, Amsoil claims it has their beefiest additive package. I am thinking of switching to this oil on my next change. However, if the dealer put a 5w30 rated for gasoline engines, you should have them change it out.

A gasoline engine combustion cycle is a "burn" process. In a diesel application the process is a literal "explosion". A violent affair which puts explosive forces on the connecting rod bearings. One of the major functions of an engine oil lubricant is cushioning. In a diesel engine one of the single life extending advances in the past 20 years was the transition from 30 to 15W-40.. I nearly doubled diesel engine bearing life!
So, in a word, NO, not ever, a 30W in a diesel engine. We need that 40W film thickness to provide that cushioning...
George Morrison, STLE CLS




Nicely put!
X-2 For me.

It may also be that they did the right thing with the oil change, but were a bit too mechanized on the paperwork and just billed it out like the other 99.8% of their oil changes. Either, way, go back and have them correct the error

A gasoline engine combustion cycle is a "burn" process. In a diesel application the process is a literal "explosion". A violent affair which puts explosive forces on the connecting rod bearings. One of the major functions of an engine oil lubricant is cushioning. In a diesel engine one of the single life extending advances in the past 20 years was the transition from 30 to 15W-40.. I nearly doubled diesel engine bearing life!
So, in a word, NO, not ever, a 30W in a diesel engine. We need that 40W film thickness to provide that cushioning...
George Morrison, STLE CLS

Not tring to piss anyone off, but my duramax fires the fuel injectors 3 times during the power stroke

explosions are instant, I cant see how a injector could fire 3 times all at once?

Mabee im wrong

:think: Huh?

Not tring to piss anyone off, but my duramax fires the fuel injectors 3 times during the power stroke

explosions are instant, I cant see how a injector could fire 3 times all at once?

Mabee im wrong

just read thru my owners manual and it says 10W-30 ok if not above a certian outside air temp, cant rember what the number was.

just read thru my owners manual and it says 10W-30 ok if not above a certian outside air temp, cant rember what the number was.

There are a couple 10w30's out there that are Diesel Spec'd, but make sure you see a diesel spec, since most are for gasoline engines.

I have had Amsoil Series 3000 5w-30 in my truck for 48.000 miles now without drainplug being removed using oil analysys once a year. I have the Amsoil Dual Remote and just change my filters.