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|  | | | Customer Reviews: | | | Average Customer Review: ( 7 customer reviews )
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Most Helpful Customer Reviews
2 of 2 found the following review helpful:
BP plugs vehicle dependent. Mfgr recommends NO anti-seize Nov 12, 2010
By Michael C. Dye
Bosch platinum plugs (reg, +2, +4) have worked very well for me in newer cars, not so well in those older than about 1999. They like higher voltage ignition systems. They can misfire with lower voltage. Sometimes larger plug wires fix it, it depends on the overall design of the ignition system.
Despite the hype on the web and anecdotal stories, virtually all spark plug manufacturers recommend against using anti-seize compound when installing plugs. They nickle-plate the threads to protect against seizing. The anti-seize compounds, even copper based, tend to increase the resistance to ground, and to upset the torque required to seat the plugs. The silver based compound will seriously increase resistance causing misfires and serious overheating of the plugs, and I have experienced the plug ceramic tips breaking off and falling into the cylinder. It sounds like a bad valve lifter and can damage the cylinder or valves. Copper based compound is less resistance, but still often too much, and any of it getting to the plug tip causes bad things. But just as big a problem is effect on plug torque.
Torquing the plugs depends greatly on the lubrication resistance of the threads, and the technique. Adding any lube, including anti-seize, reduces friction so that using a torque wrench results in the plug turning farther, stretching the materials as it does, to achieve the recommended torque value. This can cause stripping and fracturing. Unless the manufacturer gives instructions for torquing plugs or bolts using lubricant, they should be done dry with clean threads. That gives proper performance and prevents them from coming loose.
Bottom line: great plugs for the right applications, when installed properly. Don't use anti-seize on plugs, because the manufacturer already accounted for it. And never over-torque them.
1 of 1 found the following review helpful:
 Excellent Performance -- Better Mileage, too !! Apr 24, 2009
By SlikLizrd
"Slik"
I have used the Busch Platinum Plus spark plugs in 2 different vehicles, each with the FORD 4.6-litre V-8 engine (the same #4041 plug is also used in Cadillacs, Chevrolets, and other GM cars and trucks)-- and I have accumulated about 150,000 total miles on cars equipped with this plug, with all cylinders firing evenly and giving excellent fuel economy.
I change the spark plugs at 30,000 mile intervals -- being very careful to BE SURE that all the spark plugs are gapped properly at .054".
When installing your new spark plugs, always BE SURE to apply an Anti-Seize compound to all the threads.
Also, BE SURE that the Bosch Platinum-Plus spark plugs are properly torqued to 180 inch-pounds (15 ft.-lbs.). Too loose, and the plugs can back out -- too tight, and the threads in the aluminum cylinder head may strip out !!
A 1-foot length of 3/8" fuel hose can be slipped over the end of the spark plug so that the plugs can be easily threaded in by hand -- and then tightened with a torque wrench. I use an inch-pound "clicker" from Craftsman (SEARS) -- for better accuracy. If the spark plugs are not tightened properly, the engine WILL NOT deliver the performance that was built into it !!
When changing spark plugs, it's a VERY wise move to replace the ignition wires at the same time -- the original "factory" wires have been problematic (engine misfires) -- and a replacement with a Bosch Premium Wire Set (available at Amazon.com) will put your ignition system in "better-than-new" condition.
Don't forget to apply a liberal amount of dielectric grease (Novagard G624 5oz Dielectric General Purpose Compound Tube - available at Amazon.com) to the inside of the spark plug boots before snapping the boots into place !!
 BeCareful GM 3.8 owner! Mar 09, 2012
By mark
believe there are 2 other GM comments regarding these plugs. One with a 3.4 V6 Grand Am(caution comments) and one with a 04 Impala 3.8(very happy). First i do not intend to "bash" Bosch and realize different vehicles can "act" differently to spark plugs...that said installed these plugs and Bosch wires to a perfectly running 01 Grand Prix 3.8 n/a with 119k. Originals in vehicle, preventative maintenance time and maybe a little more mpg! After installed major idle/running issues-almost dead missing.. After quite a while of crosschecking wires and each individual plug firing(in case i cracked one upon installing) road tested for the heck of it and ive got problems (check engine light illuminated surely for misfire). rechecked in driveway then after a 1 hour cooldown break re-installed the original 119k Delco plugs. Boschs appeared to be firing off the sides of the electrodes from heat/spark markings on the new plugs. AND vehicle runs PERFECT with the 119k mile a/c delco plugs re-installed! Just trying to save another do-it-yourselfer half a days aggrivation and 2 sets of expensive plugs, ordering oem delco's now - should be able to install them pretty quick now with the practice i had yesterday!
I personally never had a problem with bosch products Feb 10, 2012
By thumper
I put these plugs on my girlfriends 2002 Pontiac Grand Prix fit great. She noticed fuel economy and i noticed a bit more accelaration. Overall a good buy. I would recomend it.
Very Pleased: Sep 10, 2011
By Ed Brown
I am very happy with my purchase, and with Amazon, you can't beat the price or the customer service that they provide.
See all 7 customer reviews on Amazon.com
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