bought a at new 09 sonata 4 cylinder in september ive changed oil at 1500 3000 and 6500 2nd change at 3000 i put in 3 quarts pennzoil platinum 520 and 2 quarts gtx 1030 the service manager at dealer told me to break it in with only regular oil till 12000 he says by using the synthetic it wont break in right is this true