EPA is a player in this. Back in there day, owners would go for "oil and lube" every 3K miles. Everything got over greased until boots ruptured. Then gobs of grease washed into storm drains. I dont know how much difference in metals and boot todays parts have but they are factory loaded with synthetic grease and sealed. "Oil change" every 6K miles no longer includes "lube". I like it. I can go under a later model with 300K miles and not find gobs of grease hanging everywhere.
