So what is 10w50 for? Harleys? or Tractors

(08-15-2015, 05:17 AM)Lord Popgun_imp Wrote: [ -> ]So what is 10w50 for? Harleys? or Tractors 
Yea, if it was the V twin oil but i was asking about the 10w 50 Castrol T4 for inline four cylinder engins not V twin. I saw they are using the 50 weight in the Triumph forum which are triples so who knows.