I just bought a new 2015 Fiat 500 Abarth. It will be driven about 30,000 miles a year and sees plenty of highway use. Factory fill is PU 5W40 Euro, which is the oil it will continue to get. The onboard computer will tell me when to change the oil, but I expect it to go off at 10k miles. I'm thinking that's too long for a small displacement high performance turbocharged engine. I'm thinking of doing a 5k OCI. The question is when should I dump the factory fill? BTW the first three oil changes are on Fiat, so no cost to me.