Why Ford no longer requires double length Seq IIIF for 5w20

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I know this topic was brought up a few months ago and I don't think anyone actually posted the reason for the change between the old Ford 5w20 spec WSS-M2C153-H and the new Ford 5w20 spec WSS-M2C930-A. The old spec required the oil to pass a double length Sequence IIIF test (160 hours) with a max vis increase of 200%. (The standard Seq IIIF for GF3 was 80 hours with 275% max vis increase.) For GF4 the Sequence IIIG test replaced IIIF and it requires 100 hours with a max vis increase of 150%. As you can see, the IIIG is quite a bit more stringent than the old IIIF. Evidently Ford concluded that any oil that can meet the IIIG requirements would in fact pass their old double length IIIF 200% max vis requirement.
 

G-MAN

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quote:
Originally posted by Ray H: You have to admire any engineering department that eventually shows up at the party. Who's runnin' the show over at Ford's, now? Homer Simpson?
[Confused]
 
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quote:
Originally posted by G-Man II:
quote:
Originally posted by Ray H: You have to admire any engineering department that eventually shows up at the party. Who's runnin' the show over at Ford's, now? Homer Simpson?
[Confused]

I'll see that [Confused] , and raise you a [Confused] . What ?
 
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