Yes you must you a Silicate free Antifreeze. Any Antifreeze with the Silicates in it will make the seal leak. And that if about $200.00 for the new pump. I use Honda because it comes premixed. After replacing one water pump, I decided not to chance it. I under stand there are other Silicate free coolants out the but I'll just stick with the Honda brand for now.
From the Northwest Corner
Pulled one of the GL1500 Service Manuals and it does state to refill with a mixture of ethylene glycol antifreeze (formulated for Aluminum Engines) and distilled water. No silicates, as it ruins the water pump and clogs the orifices in the water jacket. You can also use the Honda Automobile coolant too.
Back in 97 I put Pres tone in my 93 made a 2500 mile trip to Wyoming a couple days after I got back the water pump started leaking. The Owners Manual for the 93 doesn't say anything about it having to be Silicate free. If I'm not mistaken most Antifreeze is 'ethylene glycol.
I remember there were a lot of guys in one of the Cycle Magazines that were up set because there was no mention of Silicate Free in the owners manual and it cost them a new water pump.
From the Northwest Corner
Honda does not make antifreeze.
Don't know who makes it but when in doubt stick to OEM.
Silicates are actually scrubbing agents that scrub the inside walls of everywhere fluids go. It is a terrific thing except on plastic and seals. It will also scrub the plastic thru if given long enough.
As for alternatives, Prestone extended life is silicate free. My 96 Silverado has the very same requirement.
Your bike, you decide.
"The best way to get a bad law repealed is to enforce it strictly." Abe Lincoln
I have always used Honda products (oil/gear/filters/coolant, etc) on my Wings. There may be better products out there, but what's a couple of extra $$ compared to a $20k motorcycle. JMHO
2009 GL1800 Silver Audio/Comfort
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Here ya go: 08C50-C321S01
__________________ "normally one will spend a lifetime following the master's way...however in some cases a lifetime is not long enough" Kotaro Sensei
current rides: '09 GL1800AD "SENSHI"; 2003 RVT1000r (RC51) "BUSHI"... certified m/c addict. IDMWT #12. GWRRA #028890