for a 2007 G35X intake exhaust tuned driven hard daily would you guys recommend getting different spark plugs? other than oem?
All i can find is stock replacement iridiums denso and ngk. thinking of going with ngk, but also found the ngk ix but those seem to be only for the DE motors.

any suggestions?

NGK makes the best ones for our cars. Long lasting with no issues.

I run bosch iridiums. Plenty happy with them for 37k miles now.

Ngk...

Why do you feel the stock plug spec is inadequate? What magic are you expecting/hoping a different plug type will do for you? The factory engineers weren't exactly a bunch of idiots; they spec'd those plugs for a reason. Unless your boosted, there's no reason your car shouldn't be fine with the stock plugs.

fyi, the stock plugs can be found on amazon for about $10 a piece with free shipping over $35 so you are looking at like $62 shipped for a set of 6 of the OEM.

I was looking like crazy for that answer here but no one gives a straight answer or the why. I went ahead and bought the NGK Laser Iridium, they are expensive but in very pleased. Cost me 120 at O'Rileys lol.

Say what?

New owner here. I bought a 2008 G35 this week with 107,000 miles on it and did a bunch of DIY stuff on it including brake fluid flush, oil change, and ATF drain and fill and spark plugs. I bought Denso FXE22HR11 Iridium Long Life Spark Plugs for about $10 each after coupons and discounts at Advance Auto Parts. Now for the bad news, when I got to the plug on the passenger side closest to the firewall I noticed that the plug threads were wet with what looked like fresh oil. From the searches I have done it sounds like the valve cover needs replacing. The car is running fine and not throwing any codes. What have your experiences been with this, do I have to replace the valve cover or can I just periodically go in and check that plug and mop up any oil that is in there? Thanks

Of course the correct thing to do is replace the gasket (although it sounds like you need to replace the whole cover to get the new spark plug tube seals), but with that said, it's not like you can't possibly squeeze a little more time out of the current one until you can come up with whatever is holding you back (time/money/both). I think you clean it up thoroughly and check it again in a thousand miles or so and see how much oil has accumulated again. Based on that, you should be able to guess how often you either need to clean it, or how soon you need to get around to fixing it properly. Be aware though, you can destroy the plug by submerging it in oil, so you may end up replacing it along with the cover gasket.

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