Originally Posted by brtnstrns
Castrol GTX 5W-30 with a Fram Tough Guard filter. I was told on another forum the Fram is a really bad filter to run with the 4V. Also, I was told by the previous owner to not run synthetic till it hit 50k miles (currently at a little over 48k) since the engine was rebuilt not long ago (mileage-wise - year-wise it was 2008).
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The whole mileage thing is BS. You can use synthetic whenever. Switch to a Wix or OE Ford filter see if it helps.