48
They use iridium of the same quality in the tip but
the purposes and specifications of the spark plugs
differ.
Q
6
A
Appearance
Iridium spark plugs provided as genuine parts
15,000 to 20,000 km
100,000 km
IK20
Longevity
High performance type
Long life type
Type
Electrode
Type
SK20R11
Platinum tip
0.7 mm
iridium tip
Tapered cut
0.4 mm iridium
tip
U-groove
The
is a high performance spark plug. The iridium spark plugs offered
as genuine parts by car manufacturers are long-life spark plugs. The center electrode in both
is made from the new iridium alloy but the purpose of both are different. Therefore, the
electrode diameter and ground electrode specifications also differ.
DENSO precious metal spark plugs are classified into the four types shown in the following
table according to the center electrode material and type.
ZU plug
(φ 0.7)
(φ 0.4)
Iridium plug
(φ 0.7)
High performance type
Long life type
Iridium alloy
Type
Electrode material
Platinum alloy
Platinum plug
(φ 1.1)
The figures in parentheses represent the diameter of the center electrode.
What are the differences between
and iridium spark plugs
offered as genuine parts by car manufacturers?