How often should the oil be changed?
Q&AAsk Your Question
1990 Mazda RX-7
Question: oil change interval
Answer #1shadetreeauto September 13, 2010, 11:57Journeyman
3000 miles is a good#
3-5K for conventional oil. Up to 8K for premium synthetics. Pull the dipstick and if th eoil is darker then a good Amber Ale then it's time. The dirt on the oil gradually destroys the bearings. Happy Holidays.