[crazyjoe]

quote:Originally posted by jramosGT

crazyjoe wrote:
Because platinum plugs aer not recommended for Turbocharged cars.

Where is this written??

I've been using platinums on my twin-turbo RX-7 since day 1, 117K miles worth. They were OE installed on purchase. The Supra Turbo and the 300ZX Turbo were likewise outfitted, so it's not just a rotary-specific item.

The recommended change interval is 25K miles, but turbo owners, especially those who use the turbos, have found that 15K miles is max.

Unless you can show me where platinums should not be used on a turbo'd car, I'll be using them.

Use what you want. While you're at it, change your oil every 500 miles or so, because that's when it starts to turn black. Make sure you use synthetic oil, too, to get the maximum wallet cleaning.

Here are a few places I found talking about use of platinum plugs in turbo motors. Beyond these, MX-5, who is a pretty damn good authority on these turbo cars, doesn't recommend them. I'll trust the word of a good mechanic any day over the word of someone looking to make money by selling me ten dollar spark plugs.

http://www.rcspoolers.com/Spark%20Plugs.htm

http://www.modernperformance.com/dcx/neonstag.shtml

http://www.z31.com/faq/turbo.faq.shtml

http://users.erols.com/makowsky/faq.htm

Just do a search for "platinum" on these pages and you should find what you are looking for. Many mfrs use platinum plugs because they last longer for emissions testing purposes, not because they optimize performance.

Enjoy.