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I haven't seen questions about this in the archives (sorry if I missed it), but as I'm edging up close to 3,000 miles on my awesome Prius (latest tankful yielded 53.1 MPG in hilly Vermont), I am wondering if it's ok to wait until the manufacturer's recommended 5,000 mile oil change or heed the warning of the dealer salesperson to do the intial change at 3,500-3,750 (which throws off all the 5,000 mi. oil changes thereafter--8,750, 13,750, etc.).