According to the recent issue of Auto World weekly, it is OK to use synthetic oil for break in on a new engine. Their experts also said that is OK to switch to synthetic oil at any time even over 100,000 miles. They give a lot of excellent info in the article. The best recommendation is to use synthetic oil when the vehicle is under harsh conditions, like towing, long time between changes and winter climate. The mag is on newstands now. Oil cost is approximatley $219 added over 100,000 miles if you change your oil every 7,500 on a 5 qt oil change. Sounds like cheap insurance to me.

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[This message has been edited by Tex-X (edited 02-20-2001).]