How can I find what the viscosity of Kohler Magnum 30 and Mobil 1 V Twin 20W-50 engine oil would be after 10, 20 and 50 hours run time?
In my Briggs VanGuard (Dhatsu) and after 50 hrs 16 HP engine...M-1 V-Twin sheared to a 40wt according to Blackstone.
I swithched to Motul 15W-50 Grp. V Synthetic Motorcycle oil...Blackstone ...after 50 hrs...remained a 50 wt.
fyi...not a biggie in V-Twin going to a 40 wt...just a bit spuprised of how much heat and shearing force a V-Twin Aircooled engine can generate.