Side by Side Comparison of: Denso vs ACDelco

I worried it mght not perform well due to the price relative to others. But i chose the Denso brand as it is a big deal for Lexus and it has lived up to the billing. Ride is definitely smoother.

Work Great

I have these in my 2004 Honda Civic, they work well.

still working

I bought these for my 2010 Lancer a bit before it was due for replacements because they were so cheap that I couldn't justify inspecting the existing plugs and not replacing them while I had them out. They seem to work at least as good as the OEM set that I took out.

OEM replacement. My 454 runs like a top. (It still drinks gas like a sailor on shore leave though)

good plugs cheaper than local

Good performance.

best deal i could find on the plugs i bought

Arrived on time and work great! Less expensive and more convenient to aquire.

Perfect replacement for my 41-921 plugs on my 2000 Impala. If I had known the OEM plugs were Iridium I would have gone with those but these platinum plugs should last as long as I own the vehicle. I have had a set of ACDelco Platinums in my 1998 GMC 1500 5.7L for 20K now and it still runs perfect

After I bought these I realized they are platinum and OEM for the Accord as near as I can tell is Iridum.

I took my car into a dealer for the airbag recall after having these in for only 500 miles and they told me I needed new plugs! I think they were just trying to scam me as they could not possibly be worn after so few miles. Goes to show you need to watch out with auto shops, even franchised dealers. In this case it was a "top rated" Honda dealer.

Perfect fit and function for my son's 2005 VW Passat with the 1.8T engine

works as intended

Change them out so no problems.

Good priced spark plugs! I don't know much about gapping them so I can't comment on that. They all looked identical out of the box.

I used these in a 1999 Toyota Camry LE 4-cyl. Seem to slightly improve engine performance over the spark plugs in there that had over 100k miles on them.

Good product. In retrospect, if you have a 3.5 GM engine mounted sideways, where you need to pull the engine forward to access the 3 rear plugs, invest in the double platinum plugs because they last longer, and you can delay the install process for quite a while...but these work great, and I'm happy.

Must gap them, but so far, so good.

ran them on my truck and no check engine light so, all good..

it runs gud thanks

These are the wrong plugs

They Fit and worked OK

ORDERED 8 SPARK PLUGS, ONLY RECEIVED 7, PAID FOR EIGHT, NOT SEVEN.. SOMEONE SHOULD DO A LITTLE QUALITY CONTROL ON THOSE PUTTING THE ORDERS TOGETHER.

If you are kind of old school like me and you still check plug index, these were way off and all different. I used the exact same plugs (except platinum instead of iridium) because I liked how "spot on" the index was @ 35 ftlb. These new plugs are 180ish degrees off and all slightly different. If 12 o'clock is spot on, 1 was 6, 1 was 8, 1 was 5 and 1 was 4. I'll probably never buy denso again. I took a chance because I liked the ones that were in it. Seller was great, this is a manufacturer issue.

Plugs worked but we're shorter than manufacturer original.

They work, but my 2005 Honda Element didn't like them. Very sluggish, down on power, lost 1 1/2 mpg.

Bought 4 of these for a Honda Element. One had cracked ceramic, so had to go to the local automotive store to replace it. The others worked great though.

This does NOT fit a Jeep JK as stated here.

Ok

Well, the only thing good about it is that my car still starts and runs. I have an '07 Honda Fit w/ 110k. Tune-up time. Pulled the factory plugs; Denso Iridium. Didn't want to spend all kinds of cheddar. Figured I'd go with platinum and save $ since these were a great price. Bad idea. Car is sluggish now and mpg have decreased by about 4 mpg. I didn't gap them before the initial install. They came .038 out of the box not .040 as stated. Stock plugs were .051, but the Fit has a "mystery gap" apparently as the manual says .039-.043 yet the OEMs came out at .051, and car parts stores quote it at .044 OR .052. W T F! So I just finished gapping these Denso Platinums to .052 and reinstalled. When I pulled them out after only 200 miles on them, they looked pretty beat up. More beat up even than the Iridiums with 110k miles. Thinking about just reinstalling those. I've only driven about 10 miles so far with these Platinums gapped to .052 so it's too small a sample time to really tell if they work well, but out of the box I give them 2 stars. Pretty pissed about this. I figured with all the reviews and the Denso name, I'd be getting great performance and gas mileage, but so far these are performing like butt plugs rather than spark plugs.

The item does not fit my BMW 2007 760li, when I purchased it was saying it fits..!!

I installed these in my 2005 SAAB and my MPG went down to 20mpg from 22-23.
I ordered NGK copper, and replaced them. (MPG went up to 22-23 on my normal commute).

poor quality product. Lasted 2 weeks, replaced with Bosch plugs

 ONLY USE OEM RECOMMENDED PLUGS FOR VOLVO. I HAVE A 2004 XC90 140k MILES AND BLEW OUT FOUR OF THE FIVE IN LESS THAN 3 WEEKS...THE OTHER REVIEWS SPEAK OF MISFIRES WELL I CONFIRM. WHEN I REMOVED THEM TODAY I WAS ABLE TO MOVE THE CENTER OF EACH OF THE BAD PLUGS IN AND OUT ( YOU CAN ACTUALLY MOVE THE ANODE FROM 0 MM GAP OR TOUCHING TO 1/4 INCH GAP WITH NO EFFORT). EVERYWHERE VOLVO SAYS PLATINUM BUT ALSO SAYS ONE MANUFACTURER. IT'S ALL ABOUT THE TURBO. Bosch FR7DPP Original Equipment Replacement Spark Plug, (Pack of 1)

Did not work

Bought these for my Honda Civic LX 2003. They worked for about a month and then one spark plug started burning and my car kept vibrating and jerky movements. Had to go to Auto Zone to get new spark plugs which is working fine.

2006 Audi s4 b7 4.2l Misfire and engine codes. Changed and all was fine. Stick to the OEM NGK

If you have a late 90's to early 2000's 5.7 vortec, use the iridium plugs. These 41-902's are very disappointing! 2 plugs lost "platinum" pads, plus 1 plug developed cracks in insulator that caused a hesitation/stumble @ 1500 to 2000 rpm under light throttle.