Unusual plug for product. Most of you that know me, know that

[Jr ///M5]

Can't speak for the M52 motor, but the M54 in Lori's 525 is VERY picky about plugs. I tried a set of the Bosch platinum plugs in it at 55k miles. There were 2 plugs listed on the ETK, despite what others said about sticking with what it came with, I went with the Bosch. Mistake...

Well, 20k miles later and the Bosch's were throwing misfire codes and the car was running rough. I ordered up a set of the NGK's that were taken out of the car and she's all happy again. The electrode on the NGK's was much bigger than the Bosch plugs. It's approaching about 84k miles now, although the milage has dropped some 2-3 miles per gallon, where it used to return 29 mpg average on the highway, it's down to 26-27. I'm thinking the 02 sensors are tiring, but there's 4 of them at a Franklin each...yikes! Guess I better be saving for the 100k tune job, let's see, brakes, serpentine belts, fuel filter, trans fluid change ($112 just for the fluid), diff change (also arm and a leg type fluid), inspection 2, and the 02 sensors...

Good luck with the iridiums in the E46 Bill, I know you gave them good reviews when they first came out a few years ago, but I haven't heard a whole lot about them since.

Jr

[Bill R.]

my ford truck 4.6 v8 that i haven't put in yet , now that they seem to work so well in the toyota i won't hesitate to put them in the ford as well. If the claimed milage increase of around 4% is accurate , Yvonne is getting 23.5 city and 33 highway in the m52 right now , steady as clockwork so that would be almost 1 mile per gallon better city and 1.32mpg better highway
If you guys are anything like us then your fuel is oxygenated in the winter and you can normally expect about a 10% drop in the winter. We switch back here around the middle of march so mileage should go back up.. I wouldn't jump into changing her o2 sensors just yet.

Can't speak for the M52 motor, but the M54 in Lori's 525 is VERY picky about plugs. I tried a set of the Bosch platinum plugs in it at 55k miles. There were 2 plugs listed on the ETK, despite what others said about sticking with what it came with, I went with the Bosch. Mistake...

Well, 20k miles later and the Bosch's were throwing misfire codes and the car was running rough. I ordered up a set of the NGK's that were taken out of the car and she's all happy again. The electrode on the NGK's was much bigger than the Bosch plugs. It's approaching about 84k miles now, although the milage has dropped some 2-3 miles per gallon, where it used to return 29 mpg average on the highway, it's down to 26-27. I'm thinking the 02 sensors are tiring, but there's 4 of them at a Franklin each...yikes! Guess I better be saving for the 100k tune job, let's see, brakes, serpentine belts, fuel filter, trans fluid change ($112 just for the fluid), diff change (also arm and a leg type fluid), inspection 2, and the 02 sensors...

Good luck with the iridiums in the E46 Bill, I know you gave them good reviews when they first came out a few years ago, but I haven't heard a whole lot about them since.

Jr

[Bill R.]

from the factory with iridium plugs and all the hybrids, honda,toyota and ford also come factory with them.

Can't speak for the M52 motor, but the M54 in Lori's 525 is VERY picky about plugs. I tried a set of the Bosch platinum plugs in it at 55k miles. There were 2 plugs listed on the ETK, despite what others said about sticking with what it came with, I went with the Bosch. Mistake...

Well, 20k miles later and the Bosch's were throwing misfire codes and the car was running rough. I ordered up a set of the NGK's that were taken out of the car and she's all happy again. The electrode on the NGK's was much bigger than the Bosch plugs. It's approaching about 84k miles now, although the milage has dropped some 2-3 miles per gallon, where it used to return 29 mpg average on the highway, it's down to 26-27. I'm thinking the 02 sensors are tiring, but there's 4 of them at a Franklin each...yikes! Guess I better be saving for the 100k tune job, let's see, brakes, serpentine belts, fuel filter, trans fluid change ($112 just for the fluid), diff change (also arm and a leg type fluid), inspection 2, and the 02 sensors...

Good luck with the iridiums in the E46 Bill, I know you gave them good reviews when they first came out a few years ago, but I haven't heard a whole lot about them since.

Jr

[winfred]

i don't see why iridiums wouldn't work well in anything, it's a small electrode but it's not shrouded like the bosch platinums so they should self clean well unlike the bosch plat's, ngk plat's are nice but pricey but the iridiums are getting cheeper and becomming a option, i remember when they were over $20 each