The OP mentioned ST 5W30 full synthetic high mileage, so I easily found the data sheet for that oil. However both ST 5W30 and 10W30 high mileage are resource conserving oil.
https://pqia.org/supertech-high-mileage-5w-30-motor-oil/
There are plenty of 10W30 full synthetic or synthetic blend oils to use, even you can use widely available motorcycle oils that are not resource conserving. For a generator engine I would choose 10W30 over 5W30 because the first one is more stable to shearing.
Just found out that Amsoil has 10W30 Small Engine Oil and it's cheaper than their dedicated motorcycle oil below:
https://amsoilcontent.com/ams/lit/databulletins/g2217.pdf
https://www.amsoil.com/p/amsoil-10w...EkZzAkdDE3NTQ5NzQ2MzckajYwJGwwJGg1NTI4MDA2OTI.
Amsoil 10W30 High Mileage
https://www.amsoil.com/p/amsoil-10w...EkZzAkdDE3NTQ5NzUyMjgkajYwJGwwJGg1MjkzNTM0MDA.
Amsoil Metric 10W30 motorcycle
https://www.amsoil.com/p/amsoil-10w...EkZzAkdDE3NTQ5NzQ1OTEkajYwJGwwJGg5NDUxODgwMDA.
Motul 7100 10W30 4T motorcycle
https://www.motul.com/en-US/products/16501?id=16501&product=MOTUL+7100+10W-30+4T
Motul 5100 10W30 4T Synthetic blend motorcycle
https://www.motul.com/en-US/products/15100?id=15100&product=MOTUL+5100+10W-30+4T
Motul 10W30 Scooter Power 4T MB motorcycle
https://www.motul.com/en-US/products/58010?id=58010&product=SCOOTER+POWER+4T+MB+10W-30
All these are non-resource conserving oils and would be much better choice than 5W30 or 10W30 resource conserving PCMO.
Motul oils are cheaper on Ebay. If any of these are too pricy for you, just use Super Tech 0W40 on your own responsibility.
https://pqia.org/supertech-high-mileage-5w-30-motor-oil/
There are plenty of 10W30 full synthetic or synthetic blend oils to use, even you can use widely available motorcycle oils that are not resource conserving. For a generator engine I would choose 10W30 over 5W30 because the first one is more stable to shearing.
Just found out that Amsoil has 10W30 Small Engine Oil and it's cheaper than their dedicated motorcycle oil below:
https://amsoilcontent.com/ams/lit/databulletins/g2217.pdf
https://www.amsoil.com/p/amsoil-10w...EkZzAkdDE3NTQ5NzQ2MzckajYwJGwwJGg1NTI4MDA2OTI.
Amsoil 10W30 High Mileage
https://www.amsoil.com/p/amsoil-10w...EkZzAkdDE3NTQ5NzUyMjgkajYwJGwwJGg1MjkzNTM0MDA.
Amsoil Metric 10W30 motorcycle
https://www.amsoil.com/p/amsoil-10w...EkZzAkdDE3NTQ5NzQ1OTEkajYwJGwwJGg5NDUxODgwMDA.
Motul 7100 10W30 4T motorcycle
https://www.motul.com/en-US/products/16501?id=16501&product=MOTUL+7100+10W-30+4T
Motul 5100 10W30 4T Synthetic blend motorcycle
https://www.motul.com/en-US/products/15100?id=15100&product=MOTUL+5100+10W-30+4T
Motul 10W30 Scooter Power 4T MB motorcycle
https://www.motul.com/en-US/products/58010?id=58010&product=SCOOTER+POWER+4T+MB+10W-30
All these are non-resource conserving oils and would be much better choice than 5W30 or 10W30 resource conserving PCMO.
Motul oils are cheaper on Ebay. If any of these are too pricy for you, just use Super Tech 0W40 on your own responsibility.
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