Originally Posted by LEADED
Per my Friends in Dearborn . FORD PCMO specs are driven by new specs . Timing Chains get 5w-30 , Timing Belts get 5w-20 , no alternatives per FORD .
Makes sense.
Originally Posted by jorton
Yes, I think 4.0 is a German engine
Yup, as far as I know the 4.0L Cologne V6 (both the pushrod and OHC versions) maintained the 5W-30 (in older applications, 10W-30 for warmer temps) and unlike their other naturally-aspirated engines never back-spec'd 5W-20.