Hey there,

I was just curious what everbody likes for spark plugs in their 240's. I've heard all these conflicting opinions from friends and thought i'd try some internet feedback.

nick, 87 245, 210k, w/ NKG plugs

First had the Bosch platinum plugs, but did not see any differences, so went back to Bosch copper.
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'89 244DL M47 162K miles

If you've got the money and you're going to keep the brick, try NGK iridium plugs for around $9 each. jp

Do these really make a difference? Saw them in the most recent IPD catalog...
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Jim 90 244DL 243K

I see a 2-4% gas mileage improve over copper NGK plugs. That's still the case after 45,000 miles. Check out the NGk or Denso web site for more details. Corvette's come with Champion iridium plugs from the factory. jp

Always had good performance from NGK copper. Other BB's I frequent have a lot of NGK proponents, too.
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Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)

I run regular run-of-the-mill NGK Copper Cores.

I replaced the plugs in my wife's 850 with the Bosch platnum 4. A great inprovement over the original 3 electrode OEM. The reason was the OEM plugs were shot. I put the 4 electrode platnum plugs in my '92 240 wagon and there was no inprovement at all! The original VOLVO (Bosch) plugs looked pretty good. I think that you will save money with the copper core plugs and get identical performance...the 4 electrode platnum plugs will last a LOT longer. I found that the plugs in the 240 were VERY hard to remove because they had been in place so long ( I just bought the 240 last month). It may be a good idea to save money with the coper core plugs and change them out more often and reduce the risk of them siezing in place. The Porsche boys never apply anti sieze to the plugs because it can cause all sorts of problems with the electricty getting from the plug to ground. I never had a problem in many years using a little engine oil ( I usually let a drip drop on the new plug threads from the dipstick) but now I install them dry. Bosch will refund your money if you find the platnum 4 plugs give no improvement. They are banking on shadetree mechanics not wanting to do the job twice. I ordered the plugs from FCP and the price was right and they arrived next day- The problem was that 1 box contained the wrong plug!!!! Now I have to see what they will do about this. I had a tough time buying 1 plug on a Sunday afternoon. When I rode a Datsun 240 Z (in the stone age) it ran best with NGK. I was a big NGK fan till I bought a BMW and it preferred the Bosch. In marine applications the Motorcraft lasts longest. Nipondenso makes a quality cheap plug as well. If you want to be sure-use what came original.