Engine Oil API Ratings Explained: What CI-4, CH-4, SN and SP Mean for Indian Vehicles
Most buyers judge engine oil by its viscosity grade – 20W40, 15W40, 10W30 – and stop there. But the engine oil API rating printed right next to that grade is just as important: it tells you how much protection the oil actually delivers and whether it is built for a petrol or a diesel engine. […]
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