Is anyone using Kawasaki engine oil for the Extended Warranty ? We just purchased a new Scag TT 27lc/61V deck this weekend. Kawasaki was at the GIE Expo and they advised that if you use their oil it would Extend the engine warranty from 2 to 4 years on all lubed parts. The problem I'm having is finding the Kawi Oil at a dealer, seems as if none of the local (within 50 miles of me) carries the product. The oil is made by Interlube of Washington State which also produces Opti-4 engine oil which has the same warranty extension. Found 1 dealer that handles Opti-4 at $ 49.99 for 6 quarts but he is 35 miles away. Does anybody use these oils and what is the price you are paying ??? Thanks.