Date registered: Jul 2005
Vehicle: 99 ML430, 00 ML320, 05 E500 4matic Wagon
Mentioned: 19 Post(s)
Quoted: 974 Post(s)
Bosch or NGK.
If they are Bosch the YR7MPP33 is the Bosch number. The come pre-gapped.
If they are NGK the best one to go with is the Laser Iridium # PLKR7A with a gap of .032.
I have used both. I have Bosch in my E500 and NGK in the ML 430. Both engines use
two plugs per cylinder and I really liked the way the NGKs worked in the ML.
In the E500 I had already purchased the Bosch plugs. When I pulled the old plugs
the factory plugs the car came with they had the MB logo on them, but they NGK plugs.
It is just an opinion, but I like the NGK plugs better.