Posted by dhermesc on August 23, 2012 at 11:26:16 from (24.248.193.103):
In Reply to: 02 F 450 engine oil posted by 37Chief on August 23, 2012 at 10:04:38:
So what if its as thin as water. If you have adequate oil pressure you are fine.
Modern engines are built with extremely tight tolerances and you need an oil thin enough to lube those tight areas. If you use too heavy of grade it will cause excessive wear as the areas that are extremely tight (like your main bearings) will be oil starved until wear increases the tolerances to a point that the heavier grade of oil can lubricate it. Put 20W50 in your 6.8L and drive it 100 miles would cause the same amount of wear to those parts as driving 50K miles.
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