I been using NGK BP6EFS and BP5EFS (For cars w/ tired heads) for some time now w/ Great results, in conjunction w/ a .028 gap on the 5's.

I did have some Beru's for a while, but since Borg Warner bough Beru getting ahold of their products has become more difficult and the last set of wires I received had to be re-built before I could use them (ends not crimped properly).

I've been using Denso plugs in my AMG 32V engines as Bosch doesn't make the correct plug anymore...so far no complaints!

BP5's are likely OK for a 380/420 but for a 500/560 I'd go w/ the 6....unless your heads are Tired and your burning a good bit of oil, then I'd run a 5.


Anything w/ an R in it is a NO. A resistor plug combined w/ resistor leads and stock cap/rotor will exceed Mercedes maximum recommended levels of resistance, to which they say damage to ignition componentry could (and IME does) result.

I'd say everyone is referencing what Bosch recommends these days, ie everything w/ a resistor built in..

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
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Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta