i am gonna work on the car tommorow. So I am gonna check timing with light, adjust valve lash, tighten alternator belt, put washers in my shifter, and rotate my tires. When should I change the oil on the break in for a motor. It doesnt smoke any more and I dont like the metal shavings being in the oil if they dont have to. It has 250 miles on it. Should I change now or wait.