"Richard, Best to start a new
"Richard, Best to start a new thread on the topic.
See your OEM manual for this gear oil information. Not Seloc, not Clymers.... OEM.
While Volvo Penta has a code for prop pitch (A, B, C, D, E, F series, etc. w/ a # designation), it is not necessarily intended to be a secret!
The two props each have a different pitch and a different diameter (unlike the M/C BIII's), so the information may confuse the user if it were given in a pitch reference, rather than a code reference.
Hope that makes sense!
The only method to determine if the props are correct, is to perform a WOT RPM test just as you would for a single prop drive.
See your OEM specs for this WOT RPM information. Follow it to the "T".
Engine must be in Full Tune, hull clean, drive clean, props in near perfect tune. "