What oil is everyone using

[Whitebeast]

I am just wondering since mine was replaced in May 2025 if it sticks with 0w-20. I do all my own oil changes. One dealer service told me 0w-20 and one said 0w-40 and GM customer support was useless.

I have always done my own as well. But with the 6.2 issue I’m thinking about having the dealer do it Incase it ever needs replaced again.
But I hate the dealer and all the upsell crap. And I don’t trust them. LOL

 

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[rackumrack]

I have always done my own as well. But with the 6.2 issue I’m thinking about having the dealer do it Incase it ever needs replaced again.
But I hate the dealer and all the upsell crap. And I don’t trust them. LOL

Same here. I am taking pictures of my receipts and rolling with that.

 

[Dennis’s Canyon]

Here’s a radical thought. Use the oil as directed in the manual.

 

[rackumrack]

Here’s a radical thought. Use the oil as directed in the manual.

That would be a novel idea if GM could find a way to make a reliable engine and not change oil specs for certain engines, through specific years. Not sure my manual is much use. Unless the Elf on a Shelf snuck into my truck and put a sticker with the correct oil to use for my situation.

 

[Jake3point0]

Mobil one. Seems to be readily available at walmart vs some of the others (whatever the designation is for diesel). I'm a firm believer that change intervals are more important than brand. I try to change every 4- 5,000 miles, never over 5. Just any good synthetic that meets the requirements with a good synthetic media filter. I change fuel filter every other oil change (again diesel). Probably overkill, but good peace of mind for $20.

 

[jonlsu]

Have the lm2 diesel. Use to use amsoil 0w20. Switched to amsoil 5w30.
Oil looks great after I sent it off to a lab and the engine sounds better after switching. May try 0w30 or 40 but havnt decided. Waiting to what demonworks on YouTube comes back with. He's been doing a good bit of testing of different oils in the diesel.

 

[Youngrodder]

I use Royal Purple 0W-20. I have a 21' with a 6.2 with 100K miles.

 

[dustybundustbuster]

Amsoil Signature Series 5w-30. 2019 Sierra Denali 6.2L.