LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Spark plugs

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Old 07-23-14, 12:01 PM
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fastegg
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Default Spark plugs

Anybody used Bosch Super 4 plugs ?..... Any comments ?
Old 07-23-14, 04:26 PM
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PureDrifter
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they're crap. google will tell you the same.

if you want a marginally hotter spark you can run regular old copper plugs, but you'll be changing them out every 20-30k miles.
Old 07-23-14, 06:03 PM
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RA40
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The factory suggested is fine.
Old 07-29-14, 03:20 AM
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fastegg
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Originally Posted by PureDrifter
they're crap. google will tell you the same.

if you want a marginally hotter spark you can run regular old copper plugs, but you'll be changing them out every 20-30k miles.
I had to ask... been reading about them... I'll stick to using the Iridium's...
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