spark plugs - I get as much conflicting information as I ...

[steved]

Its as conflicting as trying to figure out the best motor oil.
Today I bought Bosch platinum for my Oldsmobile and found for my Mercedes I should get the Bosch+2 or +4 says the counter guy. Then he sincerely tells me he went from 16 to 18 MPG's with his truck after installing the +4. I did the math. If I went from my 16.5 MPG Premium gas (ML320) to just 18.5 these plugs would pay for thmselves in a couple months.
But at other car sites I read they are a waste of money. Why can't consumers report or someone tell us if they work or not. Anyone have expericence out there? ..I did buy the NGK uritiunum sp? at about $8 a plug for my Acura Legend. No change in mileage or performance.

 

[piestore]

plugs

Hi

I'm quite sure that if these plugs gave any better performance or fuel economy mercs would fit them from new.

 

[steved]

auto zone did say Mercedes demanded the +2 or +4

The counter guy said the regular Bosch was not recommended . the plus 2 or plus 4 are available for the ML320.

 

[KLP 92]

I have found an icrease in mpg with the BOSCH super 4, but by 1 mpg.
they are good plugs but cot 4-5 times that of a normal plug.
We all know how greedy Mercedes are!