quote:I believe the urban legend here acknowledges that the base oil in Motorcraft and other Conoco oils is 60% Group III. And when the new SM/GF-4 specs came out some oil companies chose to meet them by going with a quality base and others with the add-pack. This may be over-simplified though.
Originally posted by vronline: Why do you say that Motorcraft has a better base oil than Havoline?
quote:You don't decide that... ...... let your engine decide which one it wants! Do two OCIs with each. Your engine will let you know... ie... engine sound.... dipstick color/cleanliness... oil pressure hot & cold.... oil life.... etc.
Originally posted by 87sammy: For 5k oci Motorcraft 5w20 or Havoline 5w20. Truck is 06 F150.