[Rhodes22-list] Engine Oil

[DCLewis1 at aol.com]

Folks,
 
It’s occurred to me that it might be a good idea to carry a quart of oil  
onboard in case the oil level warning light on our outboard came  on.  The motor 
is an 89 Yamaha 4 stroke.  I have no idea how  many hours are on the engine, 
but it's a long way from new.
 
Is there a reason to use the special 4 stroke outboard motor oils from West  
Marine, or special oil from Yamaha, or will any good quality 10W-30 
(automotive)  engine oil work for a 4 stroke outboard motor?
 
Thanks for any input.
 
Dave