Hi,

I've recently switched over from standard dinosaur oil to Mobil 1 0w40. I took some folks advice from here as they seem to like it. I've read various comments and sites stating that you should change your oil after anywhere between 500 miles and 3000 miles on the first synthetic switchover. The oil pump getting clogged and the like are listed as reasons.

At what mileage do you change out the synthetic oil after the first installment? My mechanic says it doesn't matter and to change it at 5K. Other sites say 500 miles to 3K. My mechanic makes money off of it when its not working, so I would like your opinion on doing it proper. Thanks.