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These high iron UOAs I've seen from 30wt Mobil 1 have surely made me not want to use it.

Originally Posted By: globey I've read that Pennzoil and QS cause sludge and that the moon landing was faked. That was helpful...

Originally Posted By: Jett Rink Bookmaker: You might want to look in the other forum (I think called "interesting articles" where Dr. aehaas has posted some writings on the whole subject of thin oils. Actually, I have read that and it weighed heavily in my decision. I've also read where any...

Originally Posted By: Titan ...cabbies I talked to in Chicago, Dallas, and Houston that used nothing but Motorcraft 5-20, and had 300,000+ miles on their cabs with no engine issues. I'm sure 5w20 is fine for those cars with their iron block, 225HP, 2V 4.6L engines. They'll probably never tach...

The Amsoil ASM 0w20 was the heaviest 20wt I could find. It had the best HT/HS at 2.8 also. If I were to go with a 20wt, that's the one I'd pick. I'm still going to go with the SSO 0w30 though and its HT/HS of 3.2.

I highly doubt that Ford would void my warranty for using a 0w30 weight oil in this engine. I could see them viewing a 10K OCI as neglect though. The 0w30 will work fine. You guys act like I'm going to tear a hole in the universe or something.

Peace of mind IS worth a lot. Outside of North America Ford seems to be recommending 5w30 for these engines. The Shelby GT500s, which have the 5.4L SC engine spec a 5w50. The 5.4L engine is not radically different than the 3V 4.6L engine. The 3V 4.6L engine in the current Mustang is a more...

I just bought a 2008 Mustang GT with the 4.6L V8. Not exactly the same 4.6L engine as in your Grand Marq, but close enough. I've been pondering this same issue for the past couple of months. I've done as much research as I can on this, and I am now convinced that the 5w20 spec is all about CAFE...

Originally Posted By: M1Accord m1 5w20 may be the best oil regular joe can get. run it for 7500 mile oci. Amsoil ASM 0w20 has better specs. I compared the major synthetic and semi-syn 5w20 and 0w20 oils for use in my '08 Mustang GT. The Amsoil specs were better than M1, PP, and MC for HT/HS...