It’s best to replace spark plugs every 60,000-100,000 miles. When you do this, it will help your Cadillac CTS run more efficiently and last longer. There are many different types of spark plugs that can be used for Cadillac CTSs nowadays.
The 2019 Cadillac CTS is a breath of fresh air for driving enthusiasts at the upper end of the luxury sports sedan market. Its rear-wheel-drive layout, well-controlled ride, and direct steering make curvy back roads easy. It has a vibe of athleticism that modern BMWs have lost, and its aggressive exterior appearance stands out from the crowd—for better or worse.
The Caddy offers all of the most popular infotainment features, including a Wi-Fi hotspot. The CTS, on the other hand, falls short in terms of luxury: rear-seat passenger space is limited, build quality isn’t consistent across models, and powertrain refinement is insufficient. Within the sport-luxury market, buyers have a wide range of alternatives to choose from, with the CTS among one of the better options.
2003 2004 2005 2006 2007 Cadillac CTS Spark Plugs
| Info/Engine | 5.7L 8-cyl engine | 3.6L 6-cyl engine |
| OEM spark plug gap | 0.040″ (1.01mm) | 0.040″ (1.01mm) |
| Qty. needed | 8 | 6 |
| Change interval | 100,000 miles | 100,000 miles |
| Best spark plug | NGK 1465 IZTR5B11 Laser Iridium Spark Plug | NGK 3587 PLTR6A-10G Laser Platinum Spark Plug |
| Popular choice | NGK 7397 TR5IX Iridium IX Spark Plug | NGK 91794 ILTR6R8G Laser Iridium Spark Plug |
| Info/Engine | 2.8L 6-cyl engine |
| OEM spark plug gap | 0.040″ (1.01mm) |
| Qty. needed | 100,000 miles |
| Change interval | 6 |
| Best spark plug | NGK 3587 PLTR6A-10G Laser Platinum Spark Plug |
| Popular choice | NGK 91794 ILTR6R8G Laser Iridium Spark Plug |
2008 2009 2010 2011 2012 2013 Cadillac CTS Spark Plugs
| Info/Engine | 3.0L 6-cyl Engine LF1 | 3.6L 6-cyl Engine LLT |
| OEM spark plug gap | 0.044″ (1.11mm) | 0.044″ (1.11mm) |
| Qty. needed | 6 | 6 |
| Change interval | 100,000 miles | 100,000 miles |
| Best spark plug | NGK 90117 ILTR6E11 Laser Iridium Spark Plug | NGK 3587 PLTR6A-10G Laser Platinum Spark Plug |
| Popular choice | Denso 4719 ITV20TT Iridium TT Spark Plug | NGK 90117 ILTR6E11 Laser Iridium Spark Plug |
| Info/Engine | 6.2L 8-cyl Engine LSA |
| OEM spark plug gap | 0.040″ (1.01mm) |
| Qty. needed | 6 |
| Change interval | 100,000 miles |
| Best spark plug | NGK 90156 ITR6G9 Laser Iridium Spark Plug |
| Popular choice | NGK 3689 TR6IX Iridium IX Spark Plug |
2014 2015 2016 2017 2018 2019 Cadillac CTS Spark Plugs
| Info/Engine | 6.2L 8-cyl Engine LT4 | 3.6L 6-cyl Engine LGX |
| OEM spark plug gap | 0.032″ (0.81mm) | 0.044″ (1.11mm) |
| Qty. needed | 8 | 6 |
| Change interval | 100,000 miles | – |
| Best spark plug | Champion 9300 RES12WYPB4 Iridium Spark Plug | Pulstar EF1H10 PlasmaCore Plug |
| Popular choice | NGK 5476 ILTR5D Laser Iridium Spark Plug | Pulstar EF1H10 PlasmaCore Plug |
| Info/Engine | 2.0L 4-cyl Engine LTG Turbo | 2.0L 4-cyl Engine LTG Turbo |
| OEM spark plug gap | 0.036″ (0.91mm) | 0.036″ (0.91mm) |
| Qty. needed | 4 | 4 |
| Change interval | 60,000 miles | 60,000 miles |
| Best spark plug | NGK 94489 ILTR6M9G Laser Iridium Spark Plug | NGK 96393 ILTR7Q9 Laser Iridium Spark Plug |
| Popular choice | Champion 9016 RES8WYPB3 Iridium Spark Plug | NGK 96393 ILTR7Q9 Laser Iridium Spark Plug |
Spark plugs ignite the fuel mixture in your car’s engine, which is what makes it go. It receives a spark from the electronic ignition in modern cars or the distributor cap and rotor in older vehicles, sitting atop the cylinder head.
Conventional spark plugs will wear out after 30,000 to 40,000 miles and cause stalling, starting difficulties, and engine misfires. Higher-cost platinum-tipped spark plugs may not need to be replaced as frequently. At the same time, it’s probably time to replace your oxygen sensor, spark plug wires, PCV valve, and fuel filter.
