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Old 05-30-2001, 11:03 AM
bstreep bstreep is offline
Registered User
Join Date: Apr 2000
Location: San Antonio, TX
Posts: 387

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.
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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