But, yes, as you say, oil technology has come a massive distance in 30 years, and you will struggle to even find the oil Honda specified. NOS does however come up from time-to-time, and I was lambasted by someone trying to sell some off on here a few years ago for mentioning exactly what you just have!
10W30 engine oil today is not what it was 30 years ago, however Javipop was looking at 10W30 [and 10W40] transmission oil. I didn't mention the GRO in my initial post as [a] the enquiry was about Motul oils, and to say "we use Rock Oil wouldn't be particularly helpful, because [b] Rock Oil isn't generally as widely available abroad as Motul tends to be. It is much more advisable, in my opinion, to use a specific transmission oil these days, as they are specifically formulated to protect against that kind of environment/use.
Oils get better and better literally year-on-year. For those interested, earlier this year API-SP was the latest rating to be introduced. The previous rating, API-SN goes back to around 2011. API is generally less specific than the European ACEA ratings, which should also carry a date on the label. Therefore an ACEA 2019/API-SN is a better specification oil than an ACEA 2018/API-SN, for example. Honda recommended an API-SE engine oil, a specification that dates back to the 70s!
With each iteration engine oils increase in specification, so an API-SN is better than an API-SM, which in turn is better than API-SL for example. This is ultimately more relevant to 4-stroke engines, but the core information is still relevant for all use cases... I wouldn't put an API-SE in my lawn mower!
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Andy.
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Last edited by Andy on Mon Feb 15, 2021 4:55 pm; edited 1 time in total