What motor oil are you running?

[Core XK]

So what kind of motor oil are yall running? And why did you chose it? And how do you like it? Ive been running Valvoline 5w-20 ever since i bought the XK almost 2 years and i like it but i want to know what are all running and how do you like it? and how many miles do you change it?

I just recently switched over to fully synthetic and actually won a free oil change from amsoil on here. I also switched to 89 octane.

I have (2) free oil changes from my local dealership so I will probably use whatever fully synth. oil they have but after that I intend to keep using Amsoil 5w-20.

I want to do anything and everything to get this engine past 200k lol