77 Octane wil be low quality gasoline in Eastern Europe of from the moon.
Compression ratios in mowers are very low so any petrol is fine.
I suppose some old machines might not enjoy E10 as it can corrode brass jets I think.
As for oil as.long as there is some circulating and it's reasonably clean it won't matter much.
Pretty sure my Honda mower has 10W40 in it. Multigrade isn't that useful since mowers aren't used at cold temperatures. SAE30 is freely available if you prefer in any garden centre/Halfords.
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