Originally Posted By: HemiHawk
I could certainly see those being the recommended OCIs for that motor. Like galldif said, very reliable motors.
I would probably use a more premium filter than the motorcraft filter for more than 7,000 miles though. I'm sure it would hold up, but just for peace of mind (and I use FL820s on my mustang).
Those mileage numbers might not be very transferable to other cars though. Thinking specifically of some direct injected cars.
As an aside, Gene K, have you done any UOA on your 5.0? I'd love to see how your oil is holding up with that beast. Do you have the optional oil cooler that came with the track pack?
I've thought about doing a UOA but it sets a lot and gets low mileage (2,000 miles a year) with a lot of drag strip passes and spirited back road driving. I'm not sure how relatable it would be to anyone else.
It does not have the oil cooler. In practice that means Roush recommends 5W20 instead of 5W50 (Track Pack) since they default to factory grade.
Given bearing loading and street temps I could not make myself stay with a 20 grade but given the low oil temps at the strip and tight factory main and rod clearances 40 or 50 grade seemed excessive.