I have my '98 5.4 Expy (80k miles) in remote Mexico and just brought back new Bosch platinum plugs from the States. Then I read several messages on this board saying the Bosch Platinum +4 is the only way to go if one is going to the trouble to change the plugs.

Should I eat the cost of the plugs I already bought and have someone bring me some +4s from the States? Will they make that much of a performance difference compared to the single platinums and will they pay for themselves in fuel savings?

thank you

 

I had a set of +4's in my 91 Explorer and the insulator was cracked and chunks missing in two of them when I was checking them after 30K. They are nice, but where did the chuncks of insulator go?

Good double plats from motorcraft are all you need.

 

I've heard mixed reviews of the +4s as well - everything from increased power and gas mileage to having several plugs burning up and falling apart.

The OEM Motorcraft double platinums seem to be the way to go - even Racerguy, a Ford tech who's on this forum, says they're the best plug available.

XXL

 

Ive seen a lot of Ford trucks go the 100000 miles on a set of the double platinum Motorcraft plugs and I believe in them. They are well designed to go the distance.

 

Chalk another one up for the Motorcraft!

 

I went 100K miles on the original Motorcraft plugs with no hint of any decrease of performance or mileage. I only changed them on a matter of principle... I prefer preventitive maintenance to waiting until something breaks since I'm often in very remote areas.

 

Bosch plugs and Fords do not work well together. It took me 2 sets of plugs and wires and losing one cylinder at a time to convince me and it now has Motorcraft back in with no problems at all!