Originally Posted By: BuickGN
Originally Posted By: RWEST
Originally Posted By: Liquid_Turbo
Originally Posted By: Riptide
Fuel for the fire.
http://corner-carvers.com/forums/showpos...19&postcount=12
Scott Whitehead, one of the engineers that worked on the Ford 4.6 modular, indicating use of 5W-20 is a no-no.
Wow. Good fuel!
Yeah, but he didn't say WHY 5-20 is no good!! Kinda' makes you wonder....
To his postulation, all I can say is we've run mostly MC (some M1) 5-20 in a variety of mod motored vans/p'ups for years, getting well over 200,000 miles (usually, before the PA road salt gets 'em) on them with no oil related issues.
Actually he did say why. The results of many engines torn down after being run on the dyno. He's an engineer for Ford, part of the development of several of the engines spec'd for 5w-20, has done much research on the dyno with 5w-20 and he recommends against it. What more do you need to hear?
This is what I don't get about this place. You can have clear evidence right in front of you that should and could end the discussion yet it doesn't. It goes more on "feelings" than facts.
I'm not sure his experiences are any longer relevant. Think about it, he was testing 2003 and 2005 MY engines. That means he was likely seeing the results based on 2001-2003 era 5W-20s. We know the early runs of 5W-20 weren't as good as what we have now.