Okay... results with my initial 7500 OCIs were unimpressive, so I targeted a shorter OCI this time, 4K, and of course the results are improved.
My engine has been consuming about a qt of M1 every 3000 miles, so I've usually topped off between a half to a whole qt on the longer OCIs. This time around I didn't top off and got 3.75 qts out from the original 5qt fill.
Since my UOAs have been disappointing with M1, and didn't justify the added expense nor the "extended" OCI, I've decided to try dino for two or three fills. Right now I'm running Pennzoil 10W30 and plan on a 4K OCI.
Let's see where my little hobby takes me. Any comments anyone?

My engine has been consuming about a qt of M1 every 3000 miles, so I've usually topped off between a half to a whole qt on the longer OCIs. This time around I didn't top off and got 3.75 qts out from the original 5qt fill.
Since my UOAs have been disappointing with M1, and didn't justify the added expense nor the "extended" OCI, I've decided to try dino for two or three fills. Right now I'm running Pennzoil 10W30 and plan on a 4K OCI.
Let's see where my little hobby takes me. Any comments anyone?