Engine oil overheating on trackdays?
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Location: Telemark, Norway
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When filling new engine oil on Monday, I noticed that the old Mobil 1 5W50 oil was contaminated with deposits (many small black hard particles). MY98 80.000km frequently used on trackdays. What is causing this? Oil overheating in the turbo? I change oil every 5000-7000 km, but sometimes this includes 2 trackdays. Should I change oil after EVERY trackday? Each "heat" lasts ~15 minutes, is that too long? I don't have an oiltemp sensor, but the water temp never raises above normal.
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