i use royal purple in my h22 eg. i could definately feel smoother revving once i started using it.
although it is $100 for 5L so OEM Honda oil is probably more worthwhile if you're not giving your car too much of a beating.
you cannot go wrong with OEM oil... just keep an eye on it... the oil you use can sometimes be dictated by the condition of your engine. For example, if it burns oil, you may look at a thicker oil etc...
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