Filled with Castrol Magnatec 10W-40 A3/B4, drove 2000 km. The oil turned black, a sticky deposit resembling carbon remains on the dipstick and is hard to wipe off with a cloth. The level does not drop, there seems to be no heavy smoke from the exhaust, but the engine has become harder to start. Mileage is 170,000 km, I have been using this brand for five years. Tell me, what could be the reason?
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