I have had great luck with Castrol and Castrol High Mileage oil, in higher mileage engines. If there is a leak, which at this point doesn't seem to be the case, Valvoline MaxLife has done the best (and only) leak repairing of the high mileage oils for us. But the Castrol seems to be the best at awesome oil pressure, quiet engine operation and long term stability. There was one UOA on a Honda CRV with Castrol High Mileage 10/30 and nearly 10,000 miles on the OCI. It had done an exceptional job, in fact still having some active additive in it. Not a recommendation to run that long, but it sure worked well in that honda! 5/30 or 10/30? If you drive nicely and take care of the vehicle, 5W-30 should be just fine. If the car is using a lot of oil or it gets really hot, the 10W-30 is a good choice, too. If you use the Castrol HM, the 5W-30 does have a heavier 30wt, so staying with the 5/30 in that particular should be fine. There are others with more experience that may have better info, but that has been our experiences. Oh, and if you want to stick with regular oil, that should be just fine...the HM oils are even better. If you don't mind spending a little more, I would really recommend the HM oils. Good luck with your new vehicle!! Being a Honda, 160000 is still a youngster.