They can and will with the correct supplies and parts (and handling). There is a reason that some oils are far more expensive than others. Oil change shops hav

They can and will with the correct supplies and parts (and handling). There is a reason that some oils are far more expensive than others. Oil change shops have an incentive to make you come back soon, so you will be told there is no need for the more expensive oil. The composition of the oil and the quality of the engine and its parts will of course influence the build up of slug.