Nissan Dealerships will keep your car running the longist, the oil you get depends on the deal the dealership' gets with the oil companies, I work for a dealership who got free oil tanks because they use("{ED)') penZoil, but after the contrcacts (ie lobbying) they now use mobile 1 and peZoil left the tanks due to removal costs, you will only find the oil at nissan dealerships because they only care abou getting your car into service.... (the oil change looses money at all places because it is a tool to get your car in for service, anywhere you go) in hopes they find other servicable needs, You will never find a dealership with the balls to rip you off (because a dealership canot afford bad presss, they only look for service thgat needs to be done and give you a priority list, ( reguarless of cost) while it may be on the expensive side they perform (most dealerships) only what needs to be done beacuse a dealership knows what go's wrong because they see it all the time, so the gambel is yours, take it to somone who knows "cars" or a dealership that only knows nissan's and is up to date on nissans and thier problems.... it is up to you and where you money is well spent (since your OEM repalcemet parts) come from a dealership anyway\
-J
PS- I may have had too much to drink before posting this