Roger, READ YOUR MANUAL.

Duratec and SVT Duratec both use 5.8 quarts with a filter change.

Rousch racing ran a test on our Duratecs.
At 5000 rpm there is less than 1/2 quart of oil left in the oil pan.
There should be at least a full quart in the pan at that RPM.
That is why they suggest we run with at least 6.3 quarts, which is .5 quarts more than what Ford suggests.
Why do you think so many Duratecs are throwing rods ?

You can run with what you want, but for the extra $2.25 for .5 quart,
it is cheap insurance against having to deal with a blown engine.

I've been running 6.5 quarts for the last 20,000 miles.
MPG is the same and the engine feels stronger with the Mobil 1 than with Dyno Oil.
Now, my next Oil change will be with Mobil 1 with SuperSyn.


Pete...

98.5 SE Sport Duratec ATX (P66L)
Black Clearcoat on Greystone
DOB 11/21/1997
DOP 12/25/1997
PIAA 510 Super White Driving Lights
SVT CAT-BACK EXHAUST (No Resonator)
DiabloSport Chip (LPQ4) - Engineered To Raise Hell
Too many other mods to list...
Sounds sweet, runs quick...
Crazy Horse Dyno @ 121.4 WHP/129.6 TQ