I agree with getting the original oil out as soon as possible. I would not go any longer than 500 miles. As far as I know, the T5 comes with Castrol Synthetic as the original oil. Check your Owner's Manual. Put in an oil that meets the correct spec for your country. I would also recommend changing oil at 7,500 mile intervals. I live in Minnesota, USA where the temps this time of year are ten degrees below zero. I change at 5,000 mile intervals. Also, use good quality fuel and the highest octane available.For the first 500 miles, Many "expert" articles I've read say to get that break-in oil out of there sooner than later, because its laden with metal particles. I would hold-off on using the synthetic oil until the second oil change, presumably the first Volvo recommended change around 10K.