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Thanks for the replies. Changing the oil is very simple on this car, so 5k OCI is not too much of a pain. I'm impressed with the car so far. An honest 36 mpg at 65mph, and much roomier than a corolla. In my previous vehicles, M1 was good for about 1 mpg on average over conventional oils. This...

I just bought a 2007 Vibe, 18k miles. 1.8L toyota 4 cyl engine. The owners manual says 5w30, 5000 miles OCI, period. The thing is, I have a 130 mile round trip commute to work. All highway. So 5k OCI would have me changing the oil every 8 weeks. In the past I have put several 100k miles on...