My '01 CL with 75K has been getting less MPG lately with no change in driving habits. I am thinking about pouring some Seafoam in the gas tank to see if that makes a difference. Do I need to change the spark plus (originals) or oil right after it runs through? Any other suggestions?

 

Yes/ You nailed it.

Clean the EGR, change plugs and do a full seafoam treatment and you should be back where you want to be.

 

You dont need to change the oil if you are just putting seafoam in your gas tank. Or even the intake. You only need to change the oil if you put the seafoam in the oil.

I would change the plugs after you seafoam the intake and fuel.

 

It's time to change the plugs at 75k anyway.

 

^ it's every 105k not 75k

 

Whatever you do, don't listen to the douchers at AutoZone who will try to tell you that you need to "lube up your fuel system" after you do a Seafoam.

 

haha whatever that means