[GreyGhost702]

GM Already back-peddled on this, according to their latest recall update they are going to do engine swaps but dump the 0w20 oil spec back in.

According to Lake Speed and other reputable oil labs, Amsoil like many boutique oils has a higher tier base oil. The biggest advantage to straying from the off-the-shelf oils comes in choosing an additive package that fits your engine build and application best. If you're just stock NA - FBO NA there's really no need to get fancy with your additive package or get too worked up about jumping up in viscosity. 0w40 will fit most. The same is mostly true for the off-the-shelf oils, pick a 0w40 that meets API spec and is dexos for your emissions. It's pure bullshit folks stating you can't run the "Euro" oil, too. I ran M1 Euro 0w40 for the first 4 years of my stock engine life, I'm happy to show you my bearings. I also ran a 5k/mi OCI. If SuperTech had 0w40 when I was stock, I would've put that in over M1, too. If anything, Euro spec is usually better for your engine in terms of higher ZDDP package. Whether or not it will carry a Dexos cert is unlikely, because most Euro formula's prioritize engine protection over emissions protection, but if it meets API-SN (SP) you're good to go.

Obviously, if you're worried about your warranty, you'll want a dexos cert but honestly dexos is just protecting your emissions equipment, and even then it's not going to make your cats live forever. Just live long enough to get you through your warranty period lol. Dexos is GM's way of pulling the leash on oil manufacturers to meet minimum standards. Yes, the cert does have minimum standards for performance and wear protection, but they cap out the additive packages to do the least harm to emissions equipment. There are non-dexos certified oils that would even meet dexos spec, but the brand refuses to pay for the stamp. I'd much rather run an oil that does the best job protecting my engine than protecting my ****ing cats. If I had cats, I'd weld a new pair every year over pulling an engine for a rebuild every 5 years. Just how I feel about. But I'm also not concerned about warranties, either. Everyone has to come to their own conclusions. You can stick what GM recommends in your car, for warranties sake. Just remember it's their responsibility to make their shareholders rich, first. And they're putting 0w20 back in the L87's.