There is a book out there written by a mechanical engineer who talks about "Breaking" the new car in right. In his book, I think his name was Sikorsky, he claimed you should change the oil in a new car at like 500, 1500 and 5,000 miles right after the car is bought new. The ATF should be changed at like 5,000 he says? I changed the oil in my Mom's 2000 3.1 Buick Century at 500 miles 1,000, 3,000 5,000 and now twice a year. BTW When I changed that oil at 500 miles guess what color it was? Black? NO! Grey! was this a special cutting oil? This book also says not to use SYN oil until at least 5,000 miles. he also says ALWAYS change the oil filter and mixing SYN and DINO is fine. He also gives driving tips on how to break the engine in by driving at certain speeds for the first few thousand miles. It seems like a wisely written book? What do you all think about this guy's ideas? BTW He says that GM, FORD and Chrslyer are fools for telling new owners that they can wait until 7,500 when SOME European makers say do it much more often and especially after just being bought????? He suggest a special Moly oil additive as the only additive worth the time and $?