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Message: [QUOTE="CATDiezel, post: 1088003, member: 4387"] Viscosity is at rated temperature. Oil manufacturers are held to the CJ-4 standard and they rate it at 100*C. For a given weight. The 6.7L has two oil classifications. #1 walmart trips or your favorite grocery store #2 Work (ford calls it severe duty) Where guys go wrong is when they want to hot rod with the grocery getting oil and then are shocked that their oil viscosity ((which they don't know)) is somewhere below zero because they are running 5 weight singer sowing machine lube oil. Lol. The biggest reason for running 5w or 10w oil in these trucks was for fuel mileage and oil consumption. Cold oil will not wipe properly off the cylinder walls as it actually pushes the oil wiper ring back into the piston grove allowing it to pass by. This is why you see big bore engines (say 35liter and up) slobber so bad. Cold oil. Heavy weight. There's a lot to explain other than just saying I want colder oil temps and throw a larger cooler on it. However. Get into strait weight oils with no additives and are ashless you want to run cooler temps. And the piston rings and cylinders are designed for that. Say an 8000hp 16 cylinder engine. It's oil runs at 140* but it's a special oil and is in its designed limitations to maintain its specific gravity and viscosity. Like said.... The road is narrow and their is a ditch on both sides. [/QUOTE]

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