Sparkplug problems

My Toyota garage says that if I replace the spark plugs with 'Laser Iridium Premium NGK IFR6T11' they will cause problems - what problems - not stated.

These are not the recommended plugs, but I have already bought them from another dealer. email to the manufacturer in the USA stated that these plugs were often used by Toyota - again not specific enough regarding use in my RAV4 (three-door version 2004; milage=40,000). Can you say what problems these plugs will cause if I go ahead and ask the dealership to use them? Is the garage just trying to frighten me into using their own brand?

Asked on 6 January 2013 by BeKiRa

Answered by Honest John
Pretty simple answer: do what your garage tells you to do.
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