I agree with the dodn't fix it if it ain't broke. You may get a lot more than you bargained for. I just pulled one because the seal was leaking and the threads stripped while I was pulling it. Igot it out but it toke some doing. You know the only way to get them out if that happens is to pull the head. nuff siad leave it alone my .02

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Ricali

03 C240 4matic wagon
95 300E 234,000
7 prior 240;s 5 still going
81 300sd gone
65 230sl gone
49 Studebaker Champion
90BMW convert.167,000
60 Dodge D-100