GenVibe - Community for Pontiac Vibe Enthusiasts

For $19 I bought a "Groupon" for a LOF and tire rotation at a well respected local chain of auto maintenance shops.
The invoice indicated they used Duramax Semi Synthetic 5x20 item #26-520. Looking on the internet it appears that is a GM product intended for diesel engines.
Anyone familiar with this oil?

Whether this is actually a diesel oil or just bears a name similar to the engine, I don't know. It could be just a standard 5w20... Details on it seem to be scarce online, and there's too many results regarding the Duramax diesel itself.

From what I can tell, according to this it seems to be a Warren Unilube product. They package a variety of house brand oils.

They appear to be making the Meijer brand oil, which I have been using lately. I have their conventional 5w30 in the Vibe and Accent, and 10w30 synthetic in my mower and generator. Haven't had problems with any of it.

Their normal price for LOF and Tire Rotation is $39.95 so I was surprised to see that were using a semi-synthetic at that price point. I bet they buy it in 55 gal drums at a very good price. I suspect that the cost to manufacture semi-synthetic is not very much more than regular oil dino oil. Also -maybe a a 95 dino oil and 5 synthetic can be called "semi-synthetic" (sort of like the claim of "Made with Real Cheese" on Cheetos). WIKI says semi-synthetics have a max of 30% synthetic.