[A lot of what manufactuters tell the consumer is aimed directly at the guy who is using fuel with all synthetic oil, without castor. ]

Yes. We also need to recognize that the manufacturer must aim his directions at the "lowest common denominator" as opposed to the individual with a great deal of expertise who is able to recognize tie idiosyncrasies of the individual engine he is using. Like it or not even with the advanced technologies at industries disposal today no two engines will have exactly the same fit, etc. Unfortunately a side effect is that all but the most specialized products must have "user friendliness" rather than ultimate performance as their ultimate objective.

jess