changing to 20/50

[Aubrey Schneider <aschneider@shaw.ca>]

I'm currently using 10/30 oil & after learning a bit more want to change
to the spec 20/50 both for the motor & gear box.
Do I need to flush them first before adding the new 20/50 or is there a
set procedure that I should follow?

Thanks in advance for your input
Aubrey 75B

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