I have a 1995 S500 (119) And I have a lifter tapping. one person told me it may be a clogged oil tube and very common among the 119 another person told me This car does not have oil tubes. Now what I need to know is how do I get a definitive answer before I go to the mechanic and make a fool of myself. I guess what Im asking is where do I go to get to the botom of this myself or proof for myself. without going to the two conflicting friends.