how often should oil pan be pulled to clean out sludge
With today's oils and scheduled oil changes you should not have any sludge issues.
I recently pulled the oil pan on my 1985 z28. To my surprise no sludge. And that was the first time it had ever been removed.
Search Chevrolet Silverado 1500 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Silverado 1500 Experts