I can't speak for his model 2016 Honda, but in my 2023. The Amsoil Metric Motorcycle is only rated API SH. My 2023 requires API SJ.
Their 10w-40 is API SM so technically the only one meets API reqs if not viscosity. I emailed Amsoil literally over a year ago to see if they would update their formula so I could use their 10w-30, and the emailed something along the lines that they update formulas as the market deems necessary...
The current and obsolete API Service Categories are listed here... it
doesn't matter if you can't find SG anymore because there were nothing
in those early API SE SG SH ratings that were motorcycle specific and
overall they will not provide the same level of performance or
protection as the current SL SM SN specifications... Manufactures prefer
customers chose the most current oil service category that is why
Manuals state to either meet SG or exceed SG API service category...
SA Obsolete For older engines; no performance requirement.
SB Obsolete For older engines.
SC Obsolete For model year 1967 and older engines.
SE Obsolete For model year 1979 and older engines.
SF Obsolete For model year 1988 and older engines.
SG - Introduced 1989 has much more active dispersant to combat black
sludge.
SH - Introduced 1993 has same engine tests as SG, but includes
phosphorus limit 0.12%, together with control of foam, volatility and
shear stability.
SJ - Introduced 1996 has the same engine tests as SG/SH, but
phosphorus limit 0.10% together with variation on volatility limits
SL - Introduced 2001, all new engine tests reflective of modern engine
designs meeting current emissions standards
SM - Introduced November 2004, improved oxidation resistance, deposit
protection and wear protection, also better low temperature
performance over the life of the oil compared to previous categories.
SN - Introduced in October 2010 for 2011 and older vehicles, designed to
provide improved high temperature deposit protection for pistons, more
stringent sludge control, and seal compatibility. API SN with Resource
Conserving matches ILSAC GF-5 by combining API SN performance with
improved fuel economy, turbocharger protection, emission control
system compatibility, and protection of engines operating on
ethanol-containing fuels up to E85.
SP - API SP is the new minimum engine oil standard developed to address
the critical needs of today's engines; including chain wear, Low Speed
Pre-Ignition, and deposit formation. API SP is the foundation for the
ILSAC GF-6 specification but does not include fuel economy. API SP is
available for different viscosity grades.Feb 19, 2020