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I use since years Mobil1 5w40 turbo diesel oil - it has the same additives as the high mileage Mobil1 oil and I drive in the same temp range like you...
This year I will fix my oil leak - 1 tiny drop daily from the valve cover gasket! Sure from there the drop goes down the engine or when I drive it drops on the cat or exhaust.
No fun to change the valve cover gasket thought. If you have to change your valve cover gasket you should change the spark plug tube seals as well.
 
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