DIY: SC300/400 Seafoam Guide! With Pictures

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10-01-14, 12:12 AM

#31

Joey-E

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Quote:

Originally Posted by irondonkey

I wouldn't use iridium plugs.

they last much longer than copper plugs, but you will also blow a HG before your plugs melt, if your motor ever got to that point.

it's got a very high melting temp. i would rather have my plugs go out, than blow a HG.

Quote:

Originally Posted by irondonkey

your motor will probably never see the point to where plugs will melt, but its just a safe keeping thing i like to do.

yeah, NGK's are the best plugs for pretty much all imports. they also make copper plugs, which is what I run.

Please dont spread incorrect info here.

Quote:

Originally Posted by Biddles

I was under the impression those NGK's were the best plugs for the 1UZ, at least that's what I gathered on here when I bought them. My RPM's have dropped back down to when I seafoamed the other day. All is good, runs perfect, ultra quiet. I was actually driving and pulled up to a red light, and I thought my car stalled, but it's just running so smooth I couldn't tell it was on...

NGK's are one the best and glad it worked out for you.

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10-01-14, 10:28 PM

#32

oldManTan

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it says in the car's manual to use iridium plugs? why would you use copper plugs???

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10-01-14, 10:56 PM

#33

myLEXsc400

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Really nice write-up, and with pics!
However, I seafoamed my SC400 a couple years ago and definitely didn't see any differences

Car had 180k when I did that.
Also, Interstate batteries are awesome, one of the best out there!
And i think the only SC's that iridium plugs are recommended is ones with the VVT-i motor. You will see no benefit to using them in a 92-97 car, except you will pay more money for plugs.