. It was once common to use engine oil in the fork and a 10w30 works nicely , because it is a 10wt base oil only . The original honda manual for CT90/CUb , asks to use the same oil for it's engine and front forks ( a 10w30 ) . However a 20w40 would probably be a bit too heavy and make the fork too stiff , by itself . So your mechanic has mixed it with the lighter fork oil to arrive at an intermediate weight (like say 15) from his personal experience . Ride the bike and observe if the fork has become too stiff for your liking . If so change it . If it feels ok , let it be . Oil is oil , no harm
.Also consider this - mechanics love shortcuts ; any mechanic would have used the oil you bought him straight away , would have been easier for him to , no complains . That he has taken all this faltu trouble to do this chemisty , at the risk of losing a good customer for future, means that probably he confidently knows what he is doing
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