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Hey there. My Corolla has Iridium plugs in it. Do I need to use these or can I replace them with Platinum? The plug selector at Walmart says Platinum is okay but the manual specifies Iridium...

Also, can anyone tell me where the drain on the engine is (to change the coolant)? Haven't seen a good answer to that one.
 

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I am pretty sure it's ok to use platinum but i would recommend using irridium its all around a better plug and is very specific to your car.
 
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