I've used M-1 5w20 a number of times. IMO, its a great oil. I have a Duratec (2.3L) engine that is easy on oil.
On one run, after doing several 2000+ all freeway round-trips, I ran an OCI of over 10,000.
But since most of my current driving is mixed, I run M-1 at a safe OCI (IMO)) of about 7,500 +/-.....and I'm doing that with my current fill of PP 5w20 as well. I use a PureOne filter exclusively, and never any make-up oil. It just doesn't use any oil no matter how long the OCI's.
I will be going to M-1 0w20 on my next OCI, after two runs of PP.
On one run, after doing several 2000+ all freeway round-trips, I ran an OCI of over 10,000.
But since most of my current driving is mixed, I run M-1 at a safe OCI (IMO)) of about 7,500 +/-.....and I'm doing that with my current fill of PP 5w20 as well. I use a PureOne filter exclusively, and never any make-up oil. It just doesn't use any oil no matter how long the OCI's.
I will be going to M-1 0w20 on my next OCI, after two runs of PP.