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It's normal! Detergents in modern oil quickly clean carbon deposits and contaminants from the engine, turning the oil black. However, if the oil becomes black within a few hundred kilometers or has a burnt smell, it may indicate engine problems (e.g., excessive fuel dilution, overheating). In that case, get the engine checked by a professional.

Common signs include blue smoke from the exhaust, a decrease in oil level between changes (without leaks), and a burnt oil smell. Burning oil is often caused by worn piston rings, valve seals, or turbocharger seals. If you notice these signs, have the engine inspected promptly to avoid further damage.

Yes, always! The oil filter traps contaminants (metal particles, sludge, etc.) to keep the oil clean. A used filter can't effectively filter new oil, leading to contaminant buildup and accelerated engine wear. Replace the oil filter with a high-quality one that matches your engine's specifications during every oil change.