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Old 12-21-2000, 02:23 PM   #1
Scooby Specialist
Member#: 1176
Join Date: Mar 2000
Chapter/Region: MAIC
Location: Potomac, MD
2012 MB E550 4M
2015 P85D

Question Spark plugs for MY99

Who makes the best spark plugs for MY99 2.5 GT Legacy...NOTE:I already have 8.5mm magnecor wire!!!

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Old 12-21-2000, 03:45 PM   #2
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Member#: 2644
Join Date: Oct 2000
Location: Vancouver, WA USA

Try a set of Bosch Platnum +4 plugs (pt # 4418) They worked great for me. Picked up a little gas mileage and no more misfires at idle.
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Old 12-21-2000, 05:21 PM   #3
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Member#: 2609
Join Date: Oct 2000
Location: Roseville, Ca, USA
98 BK-GT White
'97 SVX Ebony Pearl

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Just read a very positive article in June 2000 AUTOMOBILE, "A Spark of Intelligence". Guess I missed it the first time around! To quote, "The Platinum+4 offers significant benefits over conventional plugs. The electrical energy required to fire the plug remains constant for up to 100,000 miles, whereas the wear and tear on a conventional plug's electrodes require a gradual increase in voltage over the same distance. Bosch commissioned an independent laboratory to measure fuel economy and noted a 4.8 percent improvement over conventional spark plugs. Use of the Platinum+4 also results in improved energy-transfer efficiency and better cold-start reliability...." Earlier in the same article Kevin Clemens states, "...They realized that if they could develop a plug with a bigger gap, it would produce a larger flame core and more complete and efficient combustion. The result of their work is the Platinum+4, which uses a pure platinum center electrode surrounded by four ground electrodes. Unlike the ground electrodes in a traditional plug, the Platinum+4's four ground electrodes are located on the same horizontal plane as the center electrode, which provides a surface air gap... The gap is preset at the factory for each of the ground electrodes..."
I've used Bosch Platinums in 3 previous cars, including 2 Subies and they delivered on the "extended use" claims. Can't say I noticed any performance improvement on the old 'Butt Dyno" though!
Glenn O
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Old 12-21-2000, 05:44 PM   #4
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Member#: 2003
Join Date: Aug 2000
Location: Calgary, Alberta, Canada
'99 BGP Legacy GT
'98 QS Legacy L (auto)


The best plug will depend on what kind of tuning you'll be doing. Whether it be NA or Forced Induction.

Some brands that I've used and recommed is :
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