https://www.canadiangunnutz.com/forum/showthread.php/523308-AR15-Lubrication-and-cleaning-thread
Use any oil you want, it doesn't really matter. What matters is that you do oil it from time to time.
I've never run my AR's dripping with oil. That is completely pointless and just makes a mess.
I take my rifle apart, clean it, and apply a light film of oil to all parts that slide against another part. There is no need to oil everything in there and coat the whole thing in oil. A drop or two on the trigger pins (from the inside), one in the sear area, another couple drops on the bolt rings before I put it into the carrier, a drop on the cam pin, and a couple drops on the carrier on the contact points, a drop on the charge handle, then assemble. I have never had an AR malfunction from lack of lube and I've owned more AR's than I can remember over the last 15 years and have run thousands of rounds through them. Every 300-500 (sometimes more) rounds I'll give the BCG a couple drops and I only do a really thorough cleaning every 1000+ or once a year whichever comes first.
I always wondered why some guys are always looking for a cheaper oil to use in their gun but if you're using 100ml of oil with every lube it becomes clear that person has no idea how lubrication works and why they can't afford to oil their gun with a quality gun oil.
As you can see from the 60+ responses from the guys as to which works best it really doesn't matter that much what you use, what matters is that you clean and lubricate your rifle when it needs it. This is why I attached the link to the sticky so you know
how to lube your rifle, the oil you choose is up to you.