Unless you have or plan on going through a ton of these cars its not really worth setting yourself up to do this. Serious IP problems are pretty rare so $100 once in a blue moon to get them tested is fine IMHO.

I have been driving MB diesels for a while now and other then messing with the delivery valve seals once I have never had to touch an IP. Well except for timing of course.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200