[AT] STP

[Ralph Goff]

Not sure if I may have asked this question before but I'm wondering 
again, how many , if any of you, use STP oil treatment in your old 
tractor engines? The reason I ask is that my Cockshutt 40 has lower oil 
pressure than I like to see. It seems to be gradually dropping as the 
years go by even though the engine is excellent and burns no oil. At 
full throttle running the snowblower it has oil pressure reading just on 
the line between normal and low. It used to be up in the o to r part of 
the word normal a few years ago. I don't know if the oil pump is wearing 
out or bearing clearances are increasing. I do regular oil and filter 
changes and have always used the same 10w-30 oil since the engine was 
rebuilt some 27 years ago.
I'm wondering if some of that good thick STP oil treatment might 
increase the oil pressure or at least provide improved lubrication to 
compensate for the lower oil pressure?
Just looking for opinions here.

Ralph in Sask.