denso iridium how long do they last
11-08-2002, 01:42 PM
#5
Suzuka Master
The factory plugs (the ones that came in your car) are 100K plugs.
There are TWO kinds of Denso Iridium plugs. Denso recommends replacing the IK16 (for CL) and IK20 (for CL Type-S) at 30,000 miles (those are the 0.4mm plugs). Denso also makes “OEM” plugs with FATTER tips (0.7mm) that are designed to last 120,000 miles.
The following text is from Denso's site:
"See BOLD BLACK vs. BOLD RED highlighted areas. (There could be OEM Iridiums in newer models or OEM models that could easily go 100K+ miles) [Check first and make sure]
Q. How long will Iridium Last?
A. Iridium use represents the most significant technological advance in automotive spark plug manufacturing, since platinum was introduced in the early eighties. As vehicle manufacturers produce increasingly complex and efficient automobiles, there is a greater need for long-life plugs that can tolerate leaner fuel mixtures and improved combustion processes.
DENSO has responded to this need by developing its Iridium alloy, originally for OE applications. For example, many newer Lexus’ and Toyota models carry an ultra long-life Iridium plug variation (.7mm with platinum tipped ground) that is capable of up to 120,000 miles of service.
DENSO Iridium Power plugs, with their .4mm center electrode, have been developed for performance applications. Because gradual wear will “round-off” firing points over time, the concentrated firing power and voltage requirement benefits will be reduced. For this reason, DENSO advises replacement after 30,000 miles.
There are TWO kinds of Denso Iridium plugs. Denso recommends replacing the IK16 (for CL) and IK20 (for CL Type-S) at 30,000 miles (those are the 0.4mm plugs). Denso also makes “OEM” plugs with FATTER tips (0.7mm) that are designed to last 120,000 miles.
The following text is from Denso's site:
"See BOLD BLACK vs. BOLD RED highlighted areas. (There could be OEM Iridiums in newer models or OEM models that could easily go 100K+ miles) [Check first and make sure]
Q. How long will Iridium Last?
A. Iridium use represents the most significant technological advance in automotive spark plug manufacturing, since platinum was introduced in the early eighties. As vehicle manufacturers produce increasingly complex and efficient automobiles, there is a greater need for long-life plugs that can tolerate leaner fuel mixtures and improved combustion processes.
DENSO has responded to this need by developing its Iridium alloy, originally for OE applications. For example, many newer Lexus’ and Toyota models carry an ultra long-life Iridium plug variation (.7mm with platinum tipped ground) that is capable of up to 120,000 miles of service.
DENSO Iridium Power plugs, with their .4mm center electrode, have been developed for performance applications. Because gradual wear will “round-off” firing points over time, the concentrated firing power and voltage requirement benefits will be reduced. For this reason, DENSO advises replacement after 30,000 miles.
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