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What makes you think the previous owner used conventional oil?
Conventional oils and Synthetics are compatible, that's why you see a bunch of blends in the market place.
You should use 0W40 Mobil 1. Your car will love you for it! Should run smoother and may get better gas mileage too.
I am sure some of the other forum members will tell you how to purchase OEM filters through the internet.
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