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Which spark plug do you use?

151
14
18
Buick Ownership
1999 Buick Park Avenue Ultra (Supercharged)
So, I will be doing a tune up on my car eventually and I was just wondering if anyone have issues with certain material spark plugs. For example, my 1999 saturn sw2 I use copper because 1) it burns a lot of oil 2) anything more than copper actually will eat your ignition modules and coils, so I use copper in that. (also super easy to change)

Any concern to using platinum, iridium, etc in our cars?
 

Fcar1953

Junior Member
99
18
8
Pittsburgh Pa
Buick Ownership
14 Lacrosse Premium AWD 15 Enclave Premium
My suggestion would be Iridium. Just put a full set of iridium plugs and GM red performance wires in one of my cars. Our Lacrosse is not ready for plugs. Mine is also a 98 that i just did.
 

Alan 55

Buick Newbie
206
70
28
Florida
Buick Ownership
2001 Buick Park Avenue, previously owned 1997 Park Avenue
In my experience the best spark plug for your vehicle is the OEM plug specified by the manufacturer. I have tried without success using various aftermarket plugs. Some were better than others but none as good as AC Delco.
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Ziggy

Full Member
380
4
18
Buick Ownership
Buick Park Avenue 91 base
Copper spark plugs have excellent conductivity but poor longevity. Iridiums have excellent longevity but mediocre conductivity.
Platinums on the other hand, have poor conductivity and mediocre longevity!

I have been using NGK V-power spark plug #3951 (TR55) for the past 10 years, they are great.
It's copper... in older cars iridium spark plugs can easily foul as they barely have any surface area, they are like needles...
 
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Drakito

Full Member
231
49
28
Southern Utah
Buick Ownership
2003 Park Avenue Ultra
I run Iridium NGK's, with a smaller gap, and 2 temperature ranges colder. But then mine is a fresh rebuild with stupid amount of performance parts, so I had to.
 

HotZ28

Full Member
7,072
333
83
Buick Ownership
1996 Roadmaster Limited Collectors Edition 58k - 1996 PAU
NGK TR-55 plugs are great for normal replacement and will last 40-K+, but if you increase boost with an S/C engine, you will need a colder heat range plug to limit Knock Retard (K/R)
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