100K miles between tuneups is not "premium" enough????hobbydad said:Has anyone upgraded to a "Premium" spark plug? Something like the Bosch Platinum 4, or one of the better plugs from NGK? Just curious if it would provide a performance/mileage improvement.
I was running platinum plugs in my Subarus back in the 80's and could go over 100K miles without touching them. Mileage never dropped and never had a starting problem.hobbydad said:I guess I'm still kind of old school when it comes to maintenance. I still find it hard to believe any plug could last that long.