Mobil 1 is fine. Thinking you won't need to change your oil until 5000 miles is absurd. Any more than around 3000 is taking a chance. Yes, some of the synthetic oils used today can last sometimes up to 5000, 10000, 15000 miles. BUT, there is NO oil filter that is any sort of effective after 3500-4000. Anytime cars come in on their scheduled 5000 mile or more oil change, there is little oil left, it has the consistency of water, is blacker than dirty diesel oil, and the filters are literally falling apart. Just thought I should share that. You want black water lubricating that engine and awesome turbo of yours?