Rover P4 Manual Rover cars will run satisfactorily on any good brand of petrol at 80 octane rating or over, but for best results a premium grade fuel should be used. In the case of the '105' model it is recommended that only premium grade fuels should be used. Owner Centre - Manuals - rover Need an owner's manual? Locate your product type and you will find a list of owner's manuals, whether your machine is a walk behind, ride on mower or chipper shredder. Can't find what you're looking for? Contact us here and we will be more than happy to help.