I have an 01 similar to you. For 175K miles i ran 6k to 8K changes with a few pushing 9K. This was on regular M1 5w30 and 10w30. It has always used about a half quart per 3 or 4 k miles. At that time i had a lifter stick and discovered i had an intake manifold gasket leak. When i took the intake off there was a thin layer of goo all over everything. Most likely caused by the antifreeze. After i got it fixed, i ran a few short runs thru it and now im running PP and QSHP 5w20 and it runs better than ever and the consumption is almost nothing.I dont know if the change in weight reduced the consumption or the switch away from M1. Well now its got 19xK miles on it and engine still used no oil and runs strong. I have had many other issues with it, but the engine seems go be doing good. I believe they are pretty easy on oil and you can almost definitely go 5K with your dino and your conditions. Also make sure your temp is up where it is supposed to me. i have had many Tstats in engines similar to this start to fail and my temp started to drift down with time. I have used several cheap stats but the superstat from Napa seems to be holding up the best of the after market ones i have tried.