It seems to be a misprint. As 1L / 40 = .025L (25 ml) which would be US 3.2 oz to one US gallon. If 40ml is used per 1L then the mix would be 25:1 (1L / 25 = .040L (40 ml)) or at least that is how my calculator figures it.
Of course I don't fool with exact mix ratios when mixing my fuel as I use a multi mix oil that is designed to be use in 16:1 to 50:1 engines so I just mix in one gallon batches per package. Of course I rinse the package back into the fuel container to get all the oil out. But we do still have fuel oils that are require to mixed by exact ratios.
Until last year the packages were 3.2 oz but the last batch came in at 2.66 oz which is a 50:1 when calculated. This is synthetic oil so they are just using a better oil now. And I have seen Amsoil synthetic oils being use at 100:1 mix ratio.
Last edited by AVB; 22/09/21 09:58 PM.
