So I checked my manual and the periodic maintenance table indicates spark plug inspection
every 12, 24 and 36 thousand kms.
Couldn't find any prompts to replace the plugs after a certain amount of kms/miles at first glance.
Furthermore, the NGK site is stating an average life of 60 and even 160 thousand kms for iridium plugs depending on type:
Type Service Life Benefits:
Nickel Alloy 20,000 - 40,000 kmsStandard style of spark Plug
(V-Groove) 20,000 - 40,000 kms Improved ignitability due to sparking at periphery of the electrode
Platinum 0.8 mm dia. 100,000 kms Long service life and even better ignitability due to a small diameter centre electrode
Iridium 0.8 mm dia. 160,000 kms Extremely long service life. Same level of ignitability 0.8 mm dia.
Platinum Iridium IX 0.6 mm dia.60,000 kms Long service life. Same as 0.8 mm dia. of Platinum and extremely good ignitability characteristics. (Better than 0.8 mm dia. platinum or 0.8 mm dia. iridium)
I am in favour of changing parts for maintenance reasons instead of waiting for them to malfunction but is there any reason not to change the plugs every 60.000kms or more?
The only thing I can think of right now is low quality fuel
Is it a case of who is listening to whom in the end?