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Discussion Starter #1
Have oil on spark plug in cylinder 3. Only experience with oil on plugs was a '96 Corolla that didn't effect its usability. Drove it for another 50k miles and it never died, just ended up selling it.

Is this a serious issue for our car? Had the top end rebuilt 25k miles ago.
105568
 

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Is that oil or fuel or coolant mixed with the soot on the plug? Just because it's black and wet does not mean oil.....
 

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Discussion Starter #4

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Discussion Starter #5
1. What is the fix if its oil?
2. What is the fix if its coolant?
3. What is the fix if its fuel?

Or do i not worry about it and just drive it until it breaks? Car runs awesome so this issue isnt effecting performance...yet.
 

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If the expansion tank is dry then you may want to be sure the coolant is at proper levels before doing anything. And if the system was at proper level at one time then obviously there is a coolant leak somewhere, possibly into the engine.

Do a hydrocarbons test on the coolant in the car and see what that tells you.....
 
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Discussion Starter #7
Just did the hydrocarbons test and it came up negative for coolant. What are the next steps?
 

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Just did the hydrocarbons test and it came up negative for coolant. What are the next steps?
Read post #2 and post #6. Do a compression and leak down test if worried or for peace of mind.
 
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