With an area of 151,563 square kilometres (58,519 sq mi), it is the nation's third-largest state. It comprises 38 municipalities (municipios). In 2010, Coahuila's population is 2,748,391 inhabitants. The five largest cities in Coahuila are the state capital city of Saltillo; the second largest is TorreÃ³n, third largest is Monclova (a former state capital), fourth largest is Ciudad AcuÃ±a, and fifth largest is Piedras Negras
From what I have read it varies with the quality of the paint and the storage conditions,but 3-5 years is reasonable for unopened cans. Most of the evidence seems anecdotal. There always seems to be a case of someone using something 20 years old that they got for free and it lasted 30 years.
And oil based paint drying time can take up to 3 weeks and as much as 30 days to fully cure. Fully cured paints of all the market varieties allow mild surface cleaning thereafter without damage, except in use of abrasive type kitchen/bathroom household cleaners that will remove outer layer of protective surface.