I've put about 100 miles on them and the car seems just as happy as ever. Went for a spirited drive today out in the hills and the car felt responsive and strong through the power range.
Autolite a103 gapped to .055" will give you about a 5hp increase and last around 30,000 miles
I found that it had Autolite Iridum spark plugs. They didn’t look bad and were gapped appropriately but I replaced them anyway with the recommended NGK spark plugs. Car has ran perfectly since then with no misfires or stuttering.
I now have the new plugs which are autolite gapped at .027 as it is suggested by autolite and also in the Bentley book.
autolites 3923 platinumsgave me the same mpg as the expensive NGK platinum.....
Don't even think the Autolite or Bosch last as long as Denso/NGK spark plugs.
autolites were fine 100 years ago
now stick with NGK or whatever OEM was. its not worth it to be fudging around and what little your gonna save may be burned up in less MPG using some other plug.
I've had nothing but bad luck with Autolite brand.
I have a poor running Audi in the shop now. While it needs more than plugs, it has autolites.
the autolites are bottom of the barrel, i've only used them once when i was young and dumb and ofc they busted while trying to repair and remove after.
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