By all means, have a MB tech do the PPI. Buyers remorse is not fun to live with. If the timing chain, guide and tensioners need to be replaced, it alone, done by a private MB shop will cost you 1500-1700. You need the PPI. Dennis

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....just drive'em!
'89 300TE White w/Blue, 152K SOLD!
'93 300E Blue w/Tan, 154K SOLD!
'01 E-320 4-Matic wagon, 130K
'67 Vette Conv. White w/Blue, 217,421K