[editor-surveyor]

I didn’t say any manual is nonsense, I said what you thought the manual said was nonsense.
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[NorthMountain]

"Nonsense" was your reply. You didn't specify. Since you haven't read the manual for MY engines, you don't know what is written in them. Furthermore, your advice to "always use SAE 30 oil" is contrary to what is written in MY engines' manuals, and may be contrary to what is written in HIS engine's manual

RTFM.

RTFM.

RTFM.

And, when in doubt, RTFM.

Pseudonymous Internet Dude doesn't have your particular piece of equipment. PID doesn't know how your particular piece of equipment should be operated. Become an educated owner/operator. RTFM.