What brand is the original spark plug for the Malibu?

[DelCecilia]

The model of the Malibu's spark plug is LTR6IX-11, which is an iridium spark plug. Main types of spark plugs include: standard spark plugs, extended insulator spark plugs, electrode spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs. Steps to replace spark plugs: Open the hood, lift the engine's plastic cover, remove the high-voltage wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one, paying attention to any external debris like leaves or dust, and clean thoroughly. Place the new spark plug into the spark plug hole, hand-tighten it a few turns, then use the socket to tighten further. Reinstall the high-voltage wires in the firing order, then snap the cover back into place.

[DeEvan]

When I took my 2013 Malibu to the 4S shop for spark plug replacement, the technician brought out an AC Delco box, model number seems to be 41-121, and the manual also indicated it was a genuine GM part. This double iridium design is quite durable, capable of running about 80,000 kilometers. However, I later heard in the car owners' group that post-2016 Malibu 2.0T models started using NGK, model IZFR6K11, the one with laser welding technology. If you want to confirm the original parts for your car, the most accurate way is to remove the currently installed spark plug and check the brand stamp on it.

[DeAyla]

Last time I replaced the spark plugs on my 2012 Malibu 2.4L myself, the old ones had the ACDelco logo engraved on them and GM's distinctive steel stamp on the threads. The maintenance list from the 4S shop stated they were GM OEM spark plugs with part number 12669107. The appendix page of the maintenance manual indicated a replacement interval of 60,000 kilometers, and the technician mentioned that these resistor-type spark plugs were specifically tuned for GM engine ignition systems. Later, in the 4S shop showroom, I saw the maintenance instructions for the new 2.0T model, which now come with NGK brand iridium-platinum spark plugs.

[SanAlex]

After consulting three Chevrolet 4S stores, it was confirmed that the original spark plugs used in the older Malibu 1.5T/2.0L models are AC Delco, model number 41-121, with a center electrode diameter of 0.6mm. However, vehicles manufactured after 2019 began to use NGK-manufactured parts interchangeably, such as the NGK ILZTR6A8G corresponding to the 1.5T engine. When purchasing the same model at an auto parts store, the owner showed a box with both GM and AC Delco logos, stating that while the packaging might change, the specifications must remain consistent, and the spark gap must be maintained at 0.9mm.