Thread: life of a 5.4
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Old September 15th, 2007, 10:29 PM   #15
chris1044
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Quote:
Originally Posted by tonka5 View Post
then why does my owners book for my 97 say use 5-30
because they changed the specs on the 5.4 later down the road....i believe 97 was the very first year that motor was in production....and from 99 on (IIRC) they state to use 5-20
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