I put Seafoam in the crankcase of my Jeep & my 300M, seemed to have cut down the blowby on both (the 300M has virtually none now, the Jeep still has it but not as bad). I haven't done the brake booster disco into the manifold on either but I probably will right before the next oil change on both. Both engines idle much smoother now too.

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k