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I always fill my vehicles with Penzoil Ultra Platinum because of all the real world tests/analysis I've seen on it. It holds up and protects extremely well even after some crazy extended drain times.

What brand do you use and why?
 

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Discussion Starter #6
Been doing a lot or research on AC Delco's (dexos2) blend and its actually pretty damn good. Really really good additive package. Heck taking advantage of the dealers FREE oil changes might not be a bad idea.
 

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I always fill my vehicles with Penzoil Ultra Platinum because of all the real world tests/analysis I've seen on it. It holds up and protects extremely well even after some crazy extended drain times.

What brand do you use and why?
If you have not already heard on them, I recommend Idparts dot com. They are carrying more Duramax compatible parts and pieces. I have used them for all of my current and previous diesels. Good crew there and great service. Not a paid endorsement either. They started life supporting the VW/Audi/Mercedez diesels and grew as other manufacturers entered the diesel fray.
 

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I still have my 2 free oil changes from the dealer. After that, I was going to go with Penzoil Platinum Euro L Full Synthetic 5w-30. It is one of the cheaper, Dexos3 approved Low Ash oils that you can buy I mean, you can put anything in there that is a full synthetic 5w-30 or whatever oil the truck takes, but I don't have money to delete the truck yet, so I have to keep my DPF. Which means I don't want it to plug up anytime soon so I'll use their approved oils for now.
 

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I just had my first oil change at 5,000 miles. The chevy dealership put 5w30 dexos 1 in my 2.8 duramax. When I said something to them they said it will be fine ??? Really !!!
 

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That's why I do my own. Call me cynical, but I think whatever they buy in bulk is what they're gonna dump in. Even if you paid more for synthetic they'd prolly just pour whatever they have in
 

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that could potentially void your warranty. powertrain warranty covers internal lubricated parts. and the wrong lubrication could be blamed for the malfunction and void a warranty claim. id take it back to them.
 

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It looks like the Castrol Edge Turbo Diesel 5w-40 is now claiming to meet the Dexos2 standard so for all the talk of of a '40' weight this may be the one that shouldn't void anything.

EDIT: I ordered the Castrol Edge 5w-40 from iDParts and they sent "Castrol Edge Professional 505 01" which does carry the ACEA C3 specification but not specifically the Dexos2 rating. They said the supplier no longer carries the Turbo Diesel (that specifically had the dexos2 spec listed) and it's been superseded by the Edge Professional - but since I'm still under warranty I really need the dexos2 listed else it must go back...

Looks like Pennzoil Euro L or Mobil 1 ESP 5w-30 for me again.
 

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Castrol 5w-30 Edge SLX dexos2 in quarts, p/n 06159 from Amazon in 6qt case. Can't find 6qt. bottles though. The Castrol website oil finder didn't have a clue. I wrote them and told them if they want this market then get on it. They actually wrote back and passed my feedback onto their website team.
 

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I went back to the dealership on Saturday. Talked to the service manager. He was very upset and they had the right oil in the back room. So they changed it and I think the tech who first changed it lost him job. He told me the tech was doing crappy work.
 

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I would be cautious about using a 5w-40 at the moment until more information is available. The engine was designed to use a 30.

My f150 5.0 used 5w-20 which I thought was odd. After some research the engine was designed to run on a 20 and the use of a 30 could cause problems with flow, increasing wear.
 

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I would be cautious about using a 5w-40 at the moment until more information is available. The engine was designed to use a 30.

My f150 5.0 used 5w-20 which I thought was odd. After some research the engine was designed to run on a 20 and the use of a 30 could cause problems with flow, increasing wear.
The LWN 2.8 is designed to run on 5w30 or 0w40. Check your owners manual or supplement.

A 5w40 and 0w40 are both 40w oil at operating temp. A 5w40 is more stable and will have a higher viscosity index and should be superior unless you live in extremely cold climate and need the 0w for startup.
 
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