Which engine oil should be used for best performance?
Which engine oil should be used for best performance, and what effect will be of iridium spark plugs?
Castrol, Shell and Mobil1 are reputed brands of engine oil, which in turn have two types of engine oils. The synthetic type is expensive and are best suited for high performance engines whereas the inexpensive mineral oil is only used in smaller and low performance engines. Also, the iridium spark plugs are extremely ignitable and have a very high melting point, making it suitable for high performance and efficiency.