Ahh. Now you add the word "wagon," an important distinction in this case. I'm not sure I deserve a thumbs down for that. Anyway, 1999 was the debut year for the C5-based Avant/wagon. If your '98 A6 is a wagon, then you have a C4.
Platforms are always associated with the body shell, not the engine. Yes, a new engine might come into being when a platform changes, but that isn't always the case, and engine certainly aren't what defines a platform. When the body and chassis changes in a major way, so too does the platform designation.
But the wagon changover from C4 to C5 happened one year later than the sedan. 1998 Sedans are C5s, 1998 Avants are C4s. In 1999, both are C5s.
The edmunds article about the "new" 1999 A6 Avant.
http://www.edmunds.com/insideline/do/Dri...
Pictures of the new 1999 A6 Avant. Yours should NOT look like this.
http://www.edmunds.com/insideline/do/Med...
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