I am a huge M1 fan. I worked for Mobil in their flight department way back when. We tested Mobil 245 and SHC100 grease in the company planes. I took parts to the engineers and they measured wear with a scanning electron microscope. Being a complete nerd, when on trips, I'd chat with the petro engineers. And when visiting the labs, I'd chat with the lube engineers. I came to really respect their methodology, knowledge and products.
I've used M1 products ever since, with fantastic results. All of my vehicles have lasted an insane number of miles. All of my race engines have been successful and every engine I've used M1 in has remained perfectly clean inside. Gobs of race car, motorcycle, aviation and high mile experience.
I'd choose M1, Extended Performance with confidence. Go to WalMart, purchase the 5 quart jugs.
Here is a look under the cap of my Jaguar 2.5L V6. An engine known for connecting rod issues. 235,000 miles, redline every shift (it is underpowered) and zero issues. Still running strong, still silent and smooth. The pic does not show it well, but a look inside shows perfect cleanliness. No sludge, no varnish, no timing chain issues, no VVT issues. My choice of oil prevented the known problems.