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MECHANICALS With a 30 year-old automobile, there will always be discussion here - maintenance, modifications and mechanicals.

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Old 17th January 2013, 07:47 AM
BenzBoy BenzBoy is offline
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Default Spark plugs?

For the 450SE - NGK or Bosch plugs?
I'm currently using Bosch and will replace them and re-time the engine this weekend. It's just that I hear people say they get a better idle from NGK. Is this true?
(Styria, these are for the car - not the bike....OK? )
Regards,
Brian
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Old 17th January 2013, 03:29 PM
B13 B13 is offline
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Default Re: Spark plugs?

NGK all the way, have been completely happy with them in my 6.9, 450SE and 190E, as well as every other non-MB car I've ever owned.

If you flood or foul the plugs by accident, in my experience only, it seems easier to clear and get running again with NGKs.

The rest of my ignition system (leads, cap, rotor button) I use Bosch or Behr.

I.
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Old 17th January 2013, 07:43 PM
BenzBoy BenzBoy is offline
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Default Re: Spark plugs?

Thanks Ian - I reckon I'll give the NGK a go. I use them in the Spirit and they are the only advised ones for it.
Regards,
Brian
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Old 17th January 2013, 07:56 PM
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Default Re: Spark plugs?

I would also go one heat range higher than suggested. For example, if they suggested plug is a BP6ES, go for a BP5ES. This was recommended to me by a fuel specialist and he was referring to today's fuel.
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Old 17th January 2013, 08:04 PM
BenzBoy BenzBoy is offline
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Default Re: Spark plugs?

I've already done that a long time back with the Bosch.
Bosch numbering for the heat range is the reverse of NGK isn't it?
Regards,
Brian

Last edited by BenzBoy; 17th January 2013 at 08:09 PM.
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Old 17th January 2013, 09:12 PM
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Default Re: Spark plugs?

Yes, lower number, hotter plug with NGK.
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Old 17th January 2013, 09:18 PM
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Default Re: Spark plugs?

Yes, higher number, hotter plug with Bosch.
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Old 17th January 2013, 09:20 PM
BenzBoy BenzBoy is offline
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Default Re: Spark plugs?

Geez - don't you love industry standards!!!
OK so NGK BP6ES is recommended so I'll go to BP5ES and see what happens.
Regards.
Brian
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Old 18th January 2013, 05:37 AM
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Styria Styria is offline
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Default Re: Spark plugs?

Well, I realize I am a bit late, but I'll go against the trend and what's been written so far. I will not use any plug other than Bosch Platinum - sure, a little more expensive, but they are long lasting and burn so much cleaner. I can look at a platinum plug three or four months after installation and it will still have the wire brush marks showing after they have been cleaned. Conventional plugs, on the other hand, will show a considerable build up of carbon. You can buy the Platinum plugs from Supercheap - they are not that much more than conventional, you can buy the correct heat range and, of all things, they are manufactured in Germany. Good enough for me. Regards Styria
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