Pros use the lubes provided by sponsors. Most use the small bottles intended for resale because that's easiest. Some get bulk shop sizes and refill the workbench bottles. Almost all squads wash and lube chains daily because the big dollar sponsors want the bikes bright and shiny. The days where someone like Fausto Coppi would start a stage with torn tape and yesterdays dirt are l-o-o-o-o-ng gone. Most also change lubes according to conditions, many coating chains in heavy grease for rainy stages.

Teams replace chains more often than we would, usually only running them 500 miles or so with 1,000 miles the outer limit. At this level of competition no team mechanic or manager wants responsibility for an avoidable mechanical failure.

BTW- Pro mechanical decisions aren't always made for pure technical decisions. Sponsor dollars, team mechanic recommendations, promoters budget, and rider preference are all factors, with top riders getting to make demands, while other riders have take what they get.