I recommend any good quality silicate-free coolant. Prestone uses silicates in their product. This ingredient is intended to "scrub" the inner surfaces of the cooling system to prevent the build up of deposits. Unfortunately, it's also real tough on the mechanical seals of motorcycle water pumps. This has been heavily discussed on several Honda and Yamaha boards I frequent, and the consensus solution is to use a silicate-free coolant. I used standard Prestone in my old V-65 Sabre, and had to replace the water pump twice during 70,000 miles of ownership. When I got my '91 VFR, I only used Havoline Dex-Cool (silicate free) coolant, and never had a lick of trouble during the 80,000 miles I put on that bike. That is what I will use when I do my first coolant change on the 'Busa.