Problems can happen in fairly short order. If the seals begin to swell, you could wind up with rock hard or severely loose steering within a fairly low number of miles. It may not leak externally, but rather destroy the seals inside the rack and lead to big problems. Again, I wouldn't. Dexron III is readily available and cheap. As JHZR2 mentioned, Honda PS fluid is proprietary stuff and isn't recommended for anything besides Honda PS systems. I wouldn't risk it. If you're looking to get rid of it, I'd just donate it to a fellow Honda owner.