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Old 05-30-2001, 12:03 PM
bstreep bstreep is offline
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Join Date: Apr 2000
Location: San Antonio, TX
Posts: 387
Thom,

On my 190SL I went to a NGK BP5 from a BP6. I believe that the BP6 is the equivalent of the Bosch you are using. Be aware, however, that a hotter plug may result in early detonation (a bad thing). However, you may have a different problem. I'd be concerned that #4 isn't firing all the time. Might want to check out your ignition, and look at putting in an electronic ignition.
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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)
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