Review on NGK 90083 LTR5BI 13 Laser Iridium by Joe Jimenez

Excellent fit for 2011 Mazda 6 with 2.5L engine. The previous owner never changed the spark plugs which have done 124,000 miles. The old plugs were difficult to remove but surprisingly were in very good condition and did not cause any handling problems. I have no doubt that this new kit will last over 100,000 miles (although I plan to swap them out well before then to avoid repeating the complicated removal process). The price was shocking, but why bother with cheaper parts when the car works so well with them? If anyone is confused by the connector number ILTR5A-13G which is listed in the Mazda owner's manual. NGK 3811 (ILTR5A-13G) discontinued - replaced by NGK 90607 (ILTR5K13) for Ford/Lincoln/Mercury and NGK 90083 (LTR5BI-13) for Mazda.