Autolite XP605 4PK Iridium Spark Plug Review

Although I've been a big fan of Bosch Platinum spark plugs since 1990, after trying them on an engine with over 200,000 miles in 2016, I've become a big fan of them . Spark plugs Autolight XP! I highly recommend it!

Without a doubt the best iridium spark plug for my 1998 C1500 5.7. I received 8 separate boxes of old iridium plugs (they are actually white without the black rings). It's an old and recognizable brand but I'll see how long they hold up.

8 spark plugs in 8 boxes, 4 new boxes, all old style plugs with 4 colored rings on the insulator. was the seller who provided my products. Since it is not 4 packs, but says 4 packs on the invoice, I'm not sure if the discount will work. All plugs seem to work, all gaps down to .048" for inline 5.7 chevy with vortec heads. They were all over .080" on arrival, not sure why so far apart. But plug 4 old forks into 4 new boxes, come on.

After installing these spark plugs in a used Mustang 3.8 I recently bought the difference is like night and day. Definitely more power and better fuel economy. I believe in iridium candles and have used them in my previous car where the dealer recommended iridium candles. While I don't think spark plugs can actually last the 100,000 miles that some claim, these should be the last plugs I need. buy for my mustang. They last longer than standard candles and will not foul unless your engine has…

Really excellent spark plugs. Regular, Platinum and Platinum Plus wear out after 12-15 thousand miles. They have 40,000 and my Ford still starts like I put them on yesterday. I don't know how long they will last. However, they are by far the best spark plugs for my minivan. I have a Ford Aerostar where changing the spark plugs is very difficult and takes hours, hours actually. So I spend extra money to buy more time between replacements. I have driven three times as many kilometers so far and…