engine oil choices

i would go for a mid priced branded 10w40 semi personally mart, and budget gear oil (my super s g/box had engine oil in for many years lol :p)
 
cheers frank,any idea on using 5w30? engines only done 36 thousand and have been told as its thinner it allows the engine to move easier?:eek:
 
Ive been using exol 10w40 semi but defo always prefur lucus 10w40 semi, but if u want it to be quieter if revving the tits off it i was always under the impression that heavy thicker weight oil would quieten it but not sure on that,
 
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