Finally!!! Another oil thread…I was going into withdrawl, and spending too much time in front of the big screen TV instead of repairing my Extra - but that's another story… Thanks, Cornishman for posting your Royal Purple experience...I have a quart to use after two engines finish breaking-in with Penz Air Cooled @32:1 ...Someone in an earlier post mentioned JASO-FC, so after Googling it, I found this premix w/ JASO-FD specs…"Quicksilver" is another brand that brings out our lube experts...I always learn something new from these oil threads...
-Ken

http://www.mercurypartsexpress.com/u...s-p264741.html