just double checked your math. you do not need 7qts of primary fluid....
i think you're gonna find that the 3 qts for the 13 is gonna be more like 3.5 qts. if you look in the owner's manual, the spec is 4.0 qts. the oil change procedure says to initially add 3.0 qts and then add additional to bring it within spec.
for the primary, i would use rotella t 15w-40. it is jaso certified for use in wet clutches and can be had from autozone, advance, etc. for about $13 for a gallon jug.
the k&n filters are nice enough, but i prefer the hd oil filters. i don't have any problems taking them off and they can be had for about half the cost of the k&n.
i've reused the derby cover quad ring gasket many times and had no leaks. on the 05, i am not sure if it has the quad ring or the pancake style. if its the pancake, i've no experience on them.
the scavenger thing, well, if it makes you feel good to use it, then go ahead. but *my opinion* is that it isn't necessary. the little bit of leftover oil is not gonna explode if it mixes with synthetic. and while it may take a quart of new oil to get the old oil out, it isn't holding a qt of old oil back.
I understand the concept of reality, but find it too confining for a way of life.
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