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There are some additives that have worked for me, and no it's not just a placibo effect.
Lucas Oil Stabilizer - gave me significantly smoother idle after a cold start.
Lucas Power Steering Stop Leak - stopped a steering box leak in my 87 300D
Amsoil Cetane Boost - gave me significantly quieter idle
Power Service Diesel Kleen - seemed to have an immediate quieting effect on rattling injectors
Bar's Radiator Stop Leak - stopped the heater core leak in my 240D (much easier than taking the whole dash apart)
StarTron Enzyme Diesel Additive - currently evaluating
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2004 VW Jetta TDI (manual)
Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL
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