Decent oil helps with clunky gears. Ideally JASO MA spec oil (like Castrol ActEvo, also has the viscosity recommended for the DR), why not use motorcycle specific oil when yopu can get it? It's not that much more than the el cheapo stuff from the supermarket that looks like bitumen after 3000km ;D
Besides warped discs you often also find clutch problems with bikes that were standing for a very long time and have corrosion on the steel discs. Giveaway for warped / rusted discs is propblems to gear down (will only gear down if you push hard or blip the throttle) and a bike that tries to crawl with first engaged & clutch pulled.
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