Posted before:
Simplify your life.
I run Shell Rotella Synthetic 5W-40 in my Chev 2500 HD diesel, Kubota BX 24, BMW R1150 RT, Yamaha FJR1300, JD 265, Honda 50 and 15 HP outboards, Chev Suburban, Ariens snowblower, Honda Rubicon 500 ATV, Honda 6500 Generator, and Craftsman 22" lawnmower. Never had a problem and never will.
Now go pleasure the Mrs. and forget about this issue for the rest of your life.
P.S. You may want to keep a small jar under the bed like I do.