I think typically, yes. But I also think we’ve been conditioned in such a way to the “authorized” dealer reasoning namely because OEM warranties almost always state the exception.
Such warranties will usually state, explicitly, that the warranty is valid only through authorized resellers to avoid problems with privity (contractual relationship) when purchased through an unknown party. And they’ll tell you who’s authorized (otherwise who would know). None of that in this specific warranty.
But also, I could not find anything in the warranty about transfer-ability of the warranty. This seemly implies that it doesn’t matter who owns it or how many times it’s transferred. Privity is naturally established with the OEM.
An example instance:
The Maine U.C.C. at 11 M.R.S.A. § 2-318 states or implies that express (ed: and implied) warranty rights may pass to a subsequent user of the item if that person was someone “whom the manufacturer, seller or supplier might reasonably have expected to use, consume or be affected by the goods.”
unless it is disclaimed. That example is from Maine but such legislation, I would think, should be relatively uniform from state to state (uniform commercial code).
Also, a warranty is not a warranty if they could successfully disclaim anything in the warranty by saying things like:
Warranty coverage is ultimately left to the discretion of Mars Hydro. We reserve the right to refuse warranty repair or replacement service to anyone.
They can say it’s their “right” but I don’t believe that would stand scrutiny. But the manufacturer can claim it as an excuse until they have to defend it in the courts. they’ll just wear you down for something that probably isn’t worth the hassle.