Nickel alloy vs recommended platinum spark plugs

[2win2rbo]

I just found out that after 10s of thousands of ks that I was running nickel alloy NGK spark plugs (BKR6E-11) on my 5SFE. According to the service manual, the minimum recommended spark plug type is platinum (BKR6EP-11 or equivalent). Even auto parts stores told me I should be running the platinum ones (as a minimum). What are the consequences of running the lower grade nickel alloy BKR6E-11s if the recommended ones are platinums?

[Al]

The only consequence is that you will probably only get 30-40,000kms instead of 100,000, but pay 1/4 of the price.

Nothing wrong with cheap NGK coppers, too many pointy shoe salesmen try and get you to spend big bucks of plugs which you don't need.

[MAGN1T]

Second hand platinums from pick a part.....platinums will outlast the motor.

Steve

[Dell'Orto]

Wouldnt bother with platinum. Copper works perfectly well...there may be a minor gain with iridium plugs, but cost vs benefit, its entirely not worthwhile.

[MR2BOY23]

for a 1/4 of the price, I'd just go with the NGK coppers and the change them on a more regular interval. For turbo application you'll probably find your changing them more often

For a car where it's more difficult to change the spark plugs, like a Subaru I'd go with platinums

[2win2rbo]

Has anyone tried Autolite plugs? What are your insights toward them?