[dubesrus_7316]

Where can I buy 0-20 oil for 2025 Silverado 3.0 diesel truck

Autozone carries Mobil1 with DexosD rating 0-W20

 

[Parthery]

Walmart, Autozone, Advance, etc... all stock Mobil 1 ESP-x2 which is DexosD as spec'ed by GM. $28 for a 5 quart jug. I buy 3 at a time and (2) PF66 oil filters at Walmart. Total cash outlay is just under $100 and I get two oil changes out of it since the trucks take 7 qts.

If I take it to the local oil change place and pay them to do it and dispose of it, they charge me $30 for the labor. An $80 oil change on these trucks is a good deal.

 

[albrigap]

Diesel oil is high in detergents to keep the engine clean of the carbon/soot from the combustion process.

I have, and still do, run Mobil 15-40 diesel oil in all my gas engines, including my Silverado 5.3.

It keeps the engine clean inside with long life.

Personally. I can see why they went to the thin oil but I feel they are not using good sense when it comes to lubrication.

I would never use any oil thinner than 10-30 and this comes from a trained diesel mechanic.

 

[Z15]

There are a few tube videos that state 5w30 is better. I will use 0w20 because of the warranty, but if GM approves 5w30 I will switch.

You would be wise to use what the OEM recommends as the engineers who designed the engine know more about the preferred viscosity those who think thicker is better. Thicker oil is harder to push through the spaces between the parts. This causes the oil pump to work harder, which in turn increases oil pressure while simultaneously decreasing oil volume. A lack of oil volume results in a decrease of lubrication and cooling, which may lead to a decrease engine part life.

 

[stephenson]

That's incorrect. Its 0W-20.
Here is official GM oil chart for 2025 models

https://gm-techlink.com/wp-content/uploads/2025/02/TechLink-engine-oil-capacities-2025_A.pdf

fyi - the 0W or 5W is the cold viscosity of the oil. Meaning when its cold and not what's cold to humans, cold means a cold engine start. At normal operating temps a 0W-20 and a 5W-20 are the same viscosity. 0W flows faster than 5W and that's better for the engine, oil gets to critical engine parts a tad faster with 0W.

Gets to parts faster? Any data to show the real world negative difference between one and the other on ital flow rates... says at 0F?

 

[stephenson]

You would be wise to use what the OEM recommends as the engineers who designed the engine know more about the preferred viscosity those who think thicker is better. Thicker oil is harder to push through the spaces between the parts. This causes the oil pump to work harder, which in turn increases oil pressure while simultaneously decreasing oil volume. A lack of oil volume results in a decrease of lubrication and cooling, which may lead to a decrease engine part life.

Do you really think the engine designers chose or spec'd the oil viscosity?

 

[bigchevyfan]

Do you really think the engine designers chose or spec'd the oil viscosity?

If they don't, who does? That's like saying cleasie Cummins didn't spec his engines to run on diesel fuel.

 

[HoosierJim]

Can I use 5w-20 gas engine oil in a Duramax 3.0 diesel engine?

You could probably use Mazola oil, but you would end up looking like Pritzker.

Can I use 5w-20 gas engine oil in a Duramax 3.0 diesel engine?

 

[bradleyz]

Where can I buy 0-20 oil for 2025 Silverado 3.0 diesel truck

If you’re in Canada, Canadian tire puts the 5qt jugs of Mobil 1 0w-20 diesel oil on for $44 every now and then. the truck takes 7qt.

 

[Smitty Smithsonite]

Modern engines barely last with the CORRECT oil these days, thanks to all the emission crap. Steer clear of gasoline oil!

 

[GregTx]

Can I use 5w-20 gas engine oil in a Duramax 3.0 diesel engine?

Oil for gas engines have detergents and rust inhibitors that diesel oil doesn't have. Don't run oil for gas engines in your diesel.

 

[fpdmotor]

Factory documentation say use 5w20 in a 2025 Silverado diesel and a YouTube diesel mechanic agreed

Yes 5/20 diesel oil not gas oil

 

[23NSBLTZ]

The viscosity is higher for one and the additives package differs from the gas. Diesel fuel has additives to control pH/pKa among a lot of different other additives that do diesel specific things. Google that question and I am sure there are published information on the topic.

Like RDF1 said not going to be conducive to longevity of the engine. Can you do it in a pinch because you are stranded absolutely and just drain and replace as soon as you resolve being stranded then return home.

Not to be "that guy" but, 5W-20 is 5W-20... that is the oil viscosity grade. But you are correct that the difference between diesel and gas engine oils is the additives... at minimum, diesel oils contain more Zinc DialkylDithioPhosphate (aka Zinc or ZDDP) than gasoline engine oils. Then above that are the additive formulas that refiners add to keep engines clean, increase mpg and longevity, etc.

 

[sigsworth.martin]

My mechanic told me this.

Use only what the manufacturer recommends And always the correct weight / viscosity.

A friend of mine was convinced upsold by an oil change company to use synthetic oil in a high mileage semi-synthetic engine. Edit - by which I mean the engine was designed to use semi synthetic oil and was a high mileage vehicle.
Side note the vehicle I was driving at the time 1985 landrover required Mineral Oil. Semi Synthetic was the new standard oil with synthetic being in very few modern cars at that time being the most modern tech.

It killed it... because it didn't cool it correctly... costing thousands to rebuild.

So now when I'm in getting an oil change and they try to upsell me I just say use what the manufacturer states.

After all it's changed after 5k.

 

[babock58]

0W20 Dexos D...which is what the manual recommends!

 

[PatDTN]

Oil for diesel engines used to contain zinc to lubricate the valves. Maybe it still does. Zinc clogs gas engines' catalytic converters so don't put oil for diesel engines into gas engines.

 

[MandD]

Can I use 5w-20 gas engine oil in a Duramax 3.0 diesel engine?

I run 15/40 Shell Rotella full synthetic oil with a OEM filter in my 2019 6.6 Duramax, however I live in a warm climate.

 

[RDF1]

My mechanic told me this.

Use only what the manufacturer recommends And always the correct weight / viscosity.

A friend of mine was convinced upsold by an oil change company to use synthetic oil in a high mileage semi-synthetic engine.

It killed it... because it didn't cool it correctly... costing thousands to rebuild.

I find this highly suspicious.

What is a high mileage semi-synthetic engine?

 

[babock58]

I run 15/40 Shell Rotella full synthetic oil with a OEM filter in my 2019 6.6 Duramax, however I live in a warm climate.

He's asking about the 3.0. Completely different engine!

 

[sigsworth.martin]

I find this highly suspicious.

What is a high mileage semi-synthetic engine?

Bad grammar

"It's a high mileage vehicle with an engine that uses semi-synthetic oil in the engine".

Although in this day an age its probably more like

it was a high mileage vehicle that had an engine that used semi-synthetic oil. As it's more likely that it's gone to the great scrap heap in the sky.