[jose.alonso]

I found these spark plug electrodes covered with white stuff and oil wet treads . Past few days been driving car under freezing weather here in KCMO and noticed lack of power, engine hesitation and vibration. Recently I did oil change from 10 w 30 to 5 w 30 also started using HEET on fuel, would that be the cause?

 

[Paul H.]

pictures?

 

[Chang oil]

This is coming from the additives to fuel
How long you been using it (Heet)

You can always look up spark plug color charts to give you a better perspective on what's going on and how your engine is running

 

[jose.alonso]

pictures?

This is coming from the additives to fuel
How long you been using it (Heet)

View attachment 307791


You can always look up spark plug color charts to give you a better perspective on what's going on and how your engine is running

Very first time, i been using Lucas frequently and always 90% or higher octane gas. I uploaded few pics the front row were the only ones with deposits the aft bank shows no sign of anything abnormal.

 

[jose.alonso]

Front ones dirty, back ones clean

 

[jose.alonso]

first and last pic are front back row, insulation like new. Second and 3rd pic are from front row

 

[Chang oil]

Need to get rid of those iridium's
They foul very quickly
Color of your plugs look good
But the white coloration is definitely the additives
Run NGK copper plugs heat range 7

 

[Chang oil]

The electrode on you plugs from the extra heat have been rounded over increasing the gap and fouling plugs out

 

[Chang oil]

Might wanna check status on the right bank 02 sensor upstream & downstream if Equipped
Sometimes with additives these also have a long term effect on catalytic converters which also make them prematurely fail

One bank / head is rich
The other bank lean

 

[Chang oil]

If the inside of pipe or O2 is bright white may lead to other issues involving coolant being introduced to the exhaust
(Head gasket / turbo)
Which also can throw the O2 off and not read correctly from foreign contaminants
And any other substances introduced with Additives getting onto the O2 sensor and read incorrectly as well