I have a few high mileage vehicles,93 Accord V6 with 529000 miles,Mobil-I 15W-50 in summers,5W-30 in winters from day one of ownership,Mercedes OM616 240D with 430000 miles,Delvac Super from day one of ownership,also my current Gurkha 4WD with OM616 turbo has crossed 78000 mile mark,fed on a regular diet of Delo 400 or Delvac MX,depending on availability,cams look brand new,so does the insides of the engine,not a drop of oil consumed,69 Nissan Patrol with HINO W04D engine,178000 miles,same Delo 400 or Delvac MX,engine inside brand new,no oil consumption.