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Originally Posted by redhorse
At what point then should you consider changing the amount of oil in a 4.6 Liter? For instance if it is bored .030, forged pistons, etc.
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I think it has more to do with, the type of duty your engine is more likely to see.
For example, if you are using your vehicle for sustained high rpm running (such as NASCAR, Road Racing, etc) you would want increased capacity to keep the chances of draining your oil pan to a minimum. Increasing your oil capacity would also help your oil last longer (as far as thermal breakdown)
I went to a 7qt capacity in my car because of the duty mine sees from drag racing and having a non self contained blower.
Does any of that make sense?