1999 Ford Expedition oil

1999 FORD EXPEDITION
90,000 MILES • V8 • AWD • AUTOMATIC
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BVH
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I noticed a increase in cold start engine rattle and changed to a blend oil to lube faster. However, I noticed after the change I had put in 5-20 rather than 5-30. Will running 20 rather than 30 weight for 3-5K miles be smart. Ford recommends 5-30.
Aug 24, 2009 at 12:16 PM
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MJR346
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Ford had a TSB come out in 2002 actually recommending 5w20 oil in all of the triton motors so you are ok

The vehicles owner manuals all so the smallest weight when built of 5w30

Don't beleive me? Beleive the Ford TSB (Messages for Mechanics sent out by Ford to inform mechanics of problems and updates seen in the field)
Aug 25, 2009 at 7:47 PM