Posted by Nedd on January 08, 2010 at 08:13:00 from (97.125.251.133):
In Reply to: Re: Engine oil posted by MarkB_MI on January 07, 2010 at 18:16:12:
I've rebuilt 4 different engines that used penzoil exclusively and three had plugged up lifter valleys (4.3 and 2-350 chevys) other one was a 2.4 with crud on the rocker arms.
Now granted the last one was in 1998 and since then I refuse to buy anything that has penzoil used. Maybe things have improved or they use better detergents. You're right that maybe I overstepped in mentioning the impurities but that has been my personal experience and has been confirmed by many mechanics that I have dealt with.
And as far as metals go. I believe there is no good way to displace all the carbon atoms from grade 8 steel melted in with iron or steel that contains less than 1 percent carbon atoms.
I don't work at the foundary but I bet there is not a person sifting through and getting rid of the grade 8 bolts and nuts before the old steel is melted down.
Same theory applies to all liquids. There are parts of the ocean that are saltier than others and there is more sugar at the bottom of your glass of kool-aid.
You just can't evenly displace carbon atoms in steel that has been recycled. But there is a tolerance level that does get met by the steel industry.
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