Can I use AP606 plugs in an 89 Lesabre 3.8?

1989 BUICK LESABRE
135,000 MILES
Avatar
CHEFGEOFF
  • MEMBER
  • 3 POSTS
I bought new plugs and when I got home, I realized I bought 606 instead of 605....I installed them anyway, and the car seems fine. Should I be worried or will they work just as well?
Jul 4, 2012 at 2:15 AM
Advertisement
Avatar
SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
Thats a different heat range plug i would put the correct one in.
Jul 4, 2012 at 2:24 AM
Avatar
CHEFGEOFF
  • MEMBER
  • 3 POSTS
Most of my trips are less than 5 miles in stop and go traffic, and the gas here is 10%ethanol, and I've been using 87 octane lately instead of 89....should any of these factors affect my heat range selection.....also, auto lite has both plugs listed as heat range e14, but I still can't find a chart from them to explain what that means
Jul 4, 2012 at 4:29 AM
Avatar
SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
No it shouldnt effect heat range needs i always stick with the stock heat range plugs Different brand plugs have different heat range charts not sure about those plugs.
Jul 4, 2012 at 4:36 AM
Avatar
CHEFGEOFF
  • MEMBER
  • 3 POSTS
Found their chart and yes they are 1 heat range hotter than stock. I wonder if Wal Mart will take them back opened and slightly used. My old plugs were seriously eroded, but otherwise looked good. Should probably take your advice and stick with the same heat range. Thanks for the help.
Jul 4, 2012 at 5:23 AM
Avatar
SATURNTECH9
  • CAR REPAIR CONTRIBUTOR
  • 30,869 POSTS
Your welcome also you said your running 87 octane instead of 89 octane if it calls for 89 octane you should run 89.The higher octane the slower the burn they run higher octane for higher compression ratios.Run the lower the octane you could get pinging/knocking and engine damage could occur.
Jul 4, 2012 at 5:33 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.