Have a '91 Honda Accord. The last set of spark plugs I installed were
http://www.boschautoparts.com/Produc.../Platinum2.htm. They currently sell for $5 ea. at the
local Advance Auto Parts store. These plugs have been in the engine for about 40K miles now.
I'm wondering whether these plugs can be expected to last a lot longer than less expensive plugs or whether they should be changed around the interval recommended in the user's manual.
I've noticed a slight roughness in the engine upon start up from a dead stop and when initially starting to accelerate from a gentle cruising. I imagine this could be attributable to various causes.
I recently changed the distributor rotor and the fuel filter. The car has 271K miles on it.