Been using Mobil 1 - 5W-30 Tri-Synthetic for the last 10,000 miles.
No leaks and the engine runs smoother.
Starting with the next Oil Change,
I am going to use a K&N HP-2010 Oil Filter too.
Mind you, I've got 79,000 miles on the Duratec now.
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
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