Sounds good- - - -since "multi weight" oils actually stay at the physical thickness of the low specification regardless of temperature, just stay away from extremely low viscosity oils like 5W-30, etc. The "high" number simply indicates that the oil lubricates like a thicker one when it's hot. The thin ones don't provide enough cushioning for parts with relatively wide oil clearances like stovebolt engines have.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!