Reply to "Engine Oil Testing Results"

I did not provide a good written discussion, mainly because this is not my area of expertise.

what I meant to imply was that for repeated starts, the oil heats up and the blowby products, including water enter the oil. during a shutdown the oil cools and those contaminates form acids.

non racing oils have the additives that are nuteralize the acids that allow allow the motor to have multiple starts. the nuturilizing base pH are also part of the detergent additives. I believe the reason racing oils don't use these additives as they reduce the extreme pressure properties of the metals and contribute to foaming.

I do believe that the TBN addatives can be purchased seprately and added. again, I have not dealt with automotive oil, but I thought that was one of the sales pitches for "AmsOil" way back when. one needs to be careful when increasing TBN as the nuetulized acids become solid metal salts and then become abbrasive

when I was driving alot for work (and making tons of overtime), I was sending samples of my motor oil for anyslis and the TBN # was the major indicator for my change interval