Critical for extreme conditions, engine oil selection hinges on:

1. Viscosity: Climate-adaptive grades ensure cold-start flow and high-temperature stability.
2. API CK-4/CF-4/CH-4: Combats wear, oxidation, and meets emission standards.
3. Additives: Detergents suspend contaminants; anti-wear agents reduce friction.
   Optimal oils maintain viscosity under thermal stress, prevent sludge, and protect high-load components. Prioritizing these factors ensures engine longevity, fuel efficiency, and reliability in demanding operations.