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Denso spark plug authenticity check #5431846 05/17/20 08:31 PM
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wing0 Offline OP
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Bought 6 plugs for a Lexus V6.
PITA to finally take out the rear 3 plugs.

Now I want to install new Denso plugs, which came in a 4pack and 2 individual packs.
All gapped around the same and iridium tips look same colour and laser welds on all 6.

The only thing I noticed is the DENSO word is a lighter shade on the 2 individual pack which is the left 2 in the following photo. On the hex, one is printed 2EM for 4pack and ENK on 2 pack. Rest of words and packaging are all the same.

Is it just 2 different batch that cause this variance in printing?

[Linked Image from i.ibb.co]
image uploader

Last edited by wing0; 05/17/20 08:31 PM.
Re: Denso spark plug authenticity check [Re: wing0] #5431863 05/17/20 08:56 PM
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2017 Mazda CX5
Mobil 1 Annual Protection 0w20
Roki OEM filter.
Re: Denso spark plug authenticity check [Re: wing0] #5431899 05/17/20 09:29 PM
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SLO_Town Offline
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FWIW, I do not order OEM parts from Amazon. The last 6 pack of Euro Castrol 0W-30 I ordered from Amazon looked different from the norm. I’ll probably dump it in my recycle drum.

For my BMWs I use Pelican, Turner, or an online BMW dealer. For our Honda and VW I only order from online dealerships.

Scott


03 BMW E46 330Ci ZSP (Euro Castrol 0W-30)
10 Honda Element SC (Castrol Magnatec 5W-30)
11 BMW E90 328i M-Sport (Pennzoil Euro 5W-40)
16 VW Passat VR6 3.6L SEL Premium (Euro Castrol 0W-40)
Re: Denso spark plug authenticity check [Re: wing0] #5431900 05/17/20 09:30 PM
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ctechbob Offline
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Where did you buy the plugs from. IMO the stamping on the hex area looks pretty suspect.


2008 Acura TL Type S-170k
2003 Honda Accord V6-222k
Oil-Havoline HM 5W30
Filter-Partsmaster 61334
Trans-Idemitsu H+
Re: Denso spark plug authenticity check [Re: SLO_Town] #5431902 05/17/20 09:32 PM
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ctechbob Offline
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Originally Posted by SLO_Town
FWIW, I do not order OEM parts from Amazon. The last 6 pack of Euro Castrol 0W-30 I ordered from Amazon looked different from the norm. I’ll probably dump it in my recycle drum.

For my BMWs I use Pelican, Turner, or an online BMW dealer. For our Honda and VW I only order from online dealerships.

Scott


Same here. I'll buy a lot of car parts from Amazon, but not plugs and anything that I'd rather have 'OEM' for. For those I'll do Rockauto, Brick and Mortar, or an online Honda/Acura dealer.


2008 Acura TL Type S-170k
2003 Honda Accord V6-222k
Oil-Havoline HM 5W30
Filter-Partsmaster 61334
Trans-Idemitsu H+
Re: Denso spark plug authenticity check [Re: wing0] #5431907 05/17/20 09:40 PM
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mk378 Offline
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The uneven pale blue lettering on the left two is a hallmark of counterfeits. The hex flats used to be stamped (not lasered) with a 4-digit lot code.

Re: Denso spark plug authenticity check [Re: SLO_Town] #5431927 05/17/20 10:21 PM
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blufeb95 Offline
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Originally Posted by SLO_Town
FWIW, I do not order OEM parts from Amazon. The last 6 pack of Euro Castrol 0W-30 I ordered from Amazon looked different from the norm. I’ll probably dump it in my recycle drum.

For my BMWs I use Pelican, Turner, or an online BMW dealer. For our Honda and VW I only order from online dealerships.

Scott

The problem with Amazon is they mix their stock and FBA stock in the warehouse and it all gets picked from the same place so it allows for supply chain contamination.

Re: Denso spark plug authenticity check [Re: wing0] #5431943 05/17/20 10:48 PM
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wing0 Offline OP
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I bought them like 5-6+ yrs ago and I just can't find where I got them from.
I'll put the 2 odd ones on the front bank so easier to change them if they are fake.

All were gapped to 0.44 and have blue tint on the electrode tip

Re: Denso spark plug authenticity check [Re: wing0] #5431965 05/17/20 11:32 PM
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slacktide_bitog Offline
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Napa and AAP actually have fair prices on Denso spark plugs, especially with AAP's promo codes smile

Re: Denso spark plug authenticity check [Re: wing0] #5432008 05/18/20 04:02 AM
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ctechbob Offline
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I would be curious to see a pic of the business end of them if you don't mind before you install them. There are usually tell-tale signs there as well.

Wish I had paid attention to mine. I just put 6 Denso's in my Accord. I didn't even bother to check the gap on them or really look that closely. They came from Rockauto.

Last edited by ctechbob; 05/18/20 04:03 AM.

2008 Acura TL Type S-170k
2003 Honda Accord V6-222k
Oil-Havoline HM 5W30
Filter-Partsmaster 61334
Trans-Idemitsu H+
Re: Denso spark plug authenticity check [Re: ctechbob] #5432010 05/18/20 04:18 AM
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blufeb95 Offline
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Originally Posted by ctechbob
I would be curious to see a pic of the business end of them if you don't mind before you install them. There are usually tell-tale signs there as well.

Wish I had paid attention to mine. I just put 6 Denso's in my Accord. I didn't even bother to check the gap on them or really look that closely. They came from Rockauto.

Rock Auto should be fine, their stuff should be coming straight from the manufacturer, unlike say Amazon where even if you buy from Amazon, they mix 3rd party's stock to be fulfilled by Amazon with Amazon's regular stock in the warehouse and you might get fakes if a third party seller sent counterfeit inventory to Amazon..

Re: Denso spark plug authenticity check [Re: blufeb95] #5432012 05/18/20 04:22 AM
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ctechbob Offline
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Originally Posted by blufeb95
Originally Posted by ctechbob
I would be curious to see a pic of the business end of them if you don't mind before you install them. There are usually tell-tale signs there as well.

Wish I had paid attention to mine. I just put 6 Denso's in my Accord. I didn't even bother to check the gap on them or really look that closely. They came from Rockauto.

Rock Auto should be fine, their stuff should be coming straight from the manufacturer, unlike say Amazon where even if you buy from Amazon, they mix 3rd party's stock to be fulfilled by Amazon with Amazon's regular stock in the warehouse and you might get fakes if a third party seller sent counterfeit inventory to Amazon..



That came out wrong. I totally trust them to ship the real stuff. I'm just curious now what the printing and stamping looked like on the 6 I got. I think my old NGK's are still in the trash can though. I might have a look at those just to compare them to NGK's online counterfeit avoidance page (They were bought from RA too)


2008 Acura TL Type S-170k
2003 Honda Accord V6-222k
Oil-Havoline HM 5W30
Filter-Partsmaster 61334
Trans-Idemitsu H+
Re: Denso spark plug authenticity check [Re: wing0] #5432033 05/18/20 05:47 AM
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2dogs Offline
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I wouldn't buy plugs on Amazon. Maybe E-bay if the seller was a dealer parts dept. Recently bought plugs from my local Subaru dealer even though they weren't the cheapest. Counterfeit plugs seem to be a problem.

. [Re: wing0] #5432062 05/18/20 06:31 AM
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Jimzz Offline
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yup
Re: Denso spark plug authenticity check [Re: wing0] #5432063 05/18/20 06:32 AM
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Jimzz Offline
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Honestly the fakes are almost impossible to distinguish from real ones now, they are that good. I bought some plugs for my inlaws car and stared at them with the OE plug out of the car and they matched perfectly. I bought "OE Nissan boxed plugs" as I was afraid of fakes in Denso boxes. Guess I did not keep up with times as they also fake OE plugs now as well. 10k later they were worn out to a nub and misfiring.


I generally order from rockauto now. Never got a fake from them and great prices. Just watch out for the "new" NGK and Denso single iridium plugs. They are NOT rated for 100k+ life.
Amazon I believe stopped mixing inventory so they should be safe as long as its Sold and shipped by them.
The autolite and new Bosch Iridums at advance with coupon are also good if you need them right away.


yup
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