Originally posted by mozha:
I just replaced my spark plugs on 2.5 V6. I used "Bosch Platinum +4". They are about the best that money can buy in my opinion. Mileage and smoother performance was immmediate. I also used some anti sieze compound as this will be critical to removal next time round as they could sieze. I also coated boots and plugs with electrolytic grease to aid in their removal next time and help prevent any possible arcing.


negative, the +4s are terrible plugs. My mpg dropped from 23 to 19 mpg (and as low as 17 mpg) over the course of 20k miles in 2 years, 3 months. Replaced them with autolite app764 and the mpg immediately jumped back to normal. my suggestion, remove them immediately, as it won't get better before it gets worse.

E0 SVT, lightly modded