When I got rid of my 08 Road King Classic 96c.i. the other year -- I had acouple quarts of Mobil 1 V-Twin 20-50 left over. I would mix half a quart with Rottela T6 Multi Vehicle 5W30 for my Ram in signature. Never seemed like an issue till the 20-50 oil was used up. Never tried it in lawn equipment though.