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Like PABLOS, I too was surprised with the high degree of oxidation and low Total Base Number TBN. I also concur with his assessment, that the oil is shot. It must have been working real hard to clean out sludge and gunk left behind by the dino oil. While Mobil 1 uses terrific synthetic base stocks, it additive package isn’t as robust Amsoil’s, Redline's, or NEO's – which is why you shouldn’t use extended drain intervals with M1. Don’t get me wrong, M1 is great stuff. You won’t even find companies like Amsoil or Redline slandering it, they’ll only say that theirs is better, which they are. While your oil analysis indicated worn out oil, your metals looked real good; very, very low wear.
If I were in your shoes, I would purchase some Amsoil Engine Flush, their Super Duty Full Flow oil filters (unless you use the cartridge insert type), and their 5W-30 or 0W-30 oil. It may go against your likey learned convention of 3000-5000 mile oil changes, but you can very safely extend your oil changes to 1 year or 25,000 miles on Amsoil (with filter changes in between) in your naturally aspirated engine. Even after a full year of service, you’d be surprised at how serviceable the old oil still is (based on your analysis of course).
Not a dealer or anything like that, just have used it for the last few years with great success. Have used it in my Jeep Grand Cherokee for the last 105,000 miles, and it does not burn a drop…amazing, I don’t even have to add oil over the course of a year, and my annual oil analyses always affirm the quality of the oil, and actually, it once identified a crack in my exhaust manafold. In my S70 T5 I’ll run if for 10,000 miles, then do an analysis to determine safe drain intervals. Car is still too new for me to know how the turbo will chew up the oil. Good luck.
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1999 S70 T5
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