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Old 05-21-2002, 04:03 PM
Registered User
Join Date: Jan 2002
Location: Monroeville, NJ
Posts: 93
Which Bosch spark plug?

I've heard a lot of pro's and con's about Bosch Platinum plugs. What's the best type for a 1987 560 SL?

M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.
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Old 05-21-2002, 07:38 PM
Ashman's Avatar
Service Advisor
Join Date: Sep 2000
Location: Sherman Oaks, CA
Posts: 4,748
I would suggest using the standard copper core bosch plugs for your car.

Platinum plugs may help other cars, but most have found they don't do much in a benz.

I have standard copper core plugs in my 300ce, my brother uses standard copper core plugs in his range rover instead of those +4 plugs, and his car runs much better now than it did with the +4 plugs that have the 4 arms over the electrode.

Check fastlane or partsshop. you should easily find the right standard plugs in there for your car.

'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.
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Old 05-21-2002, 08:35 PM
blackmercedes's Avatar
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Most MB engines, especially pre 1996 engines, do not do well with platnium plugs. The installation of those plugs has lead to running problems in many cars.

I would highly recommend you stay with copper plugs. You'll save money and potential headaches.
John Shellenberg
1998 C230 "Black Betty" 240K

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Old 05-22-2002, 09:53 AM
Registered User
Join Date: Apr 2000
Location: Location: Berthoud, Co. USA
Posts: 75
Which bosch spark plugs

I just took a set of platnium +4s out of my 300E and put in the correct H9DCO plugs and the intermittant rough idle seems to be gone. I did not realize my independant mech had put in the +4s
over two years ago and have suffered with the rough idle ever since.
88 300E 225K Sold
2000 C230K Totaled @103K
2003 ML320 140K Granddaughters Limo
2009 E350 4Matic Sport 37K Sold
2011 ML350 44K
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