The 3001 K&N oil filter is about 30% larger then standard for the same price.
Synthetic oil is good but only if you change it more frequently then what is recommended. Rover engines run too rich and polute the engine oil by 3000 miles so I would suggest you stay witha good oil, like Castrols 20/50W with 3000 mile changes.
I don't recommend 10/30W oil of any brand because Rover engines have enough low end oil pressure problems without our making it worse. It might be fine in the snow country in the winter other wise go heavy.
Mike
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