Engine oil

You Father in law states - My father in law's opinion was that execpt for the extra zinc and phosphorus needed for break in, all the additives you need are already in your oils.

That is not what I have read..we need them for operation as well..

Perhaps, if he does the summary for you, he can explain this comment..because it diametric opposite what other "experts" are saying.. and I am no position to even talk on this issue but am willing to list to all.. :)

Thanks
Grassy