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#4535260 - 10/06/17 09:44 AM quality difference in radiator caps
edwardh1 Offline

Registered: 01/17/03
Posts: 2821
Loc: Coastal South Carolina
toyota oem (is that Denso?) $15 from Amazon , dont know what the dealer wants.
stant and gates are in the $5-$7 range

any opinions on stant vs gates?

or how to find the toyota 2004 highlander v6 highlander oem stock number? amazon lists the numbers on the stats they sell, but don't say what it fits.
Prius? In line water heater? Solar?
All save energy, but may not save money (complicated, no DIY, parts hard to get, , parts expensive, etc).

#4535271 - 10/06/17 10:09 AM Re: quality difference in radiator caps [Re: edwardh1]
Leo99 Offline

Registered: 03/30/14
Posts: 2752
Loc: NJ
My n=1 story: Replaced the factory cap on my Rav4 last year with a Stant from Amazon. Cap arrived looking very generic and then failed 9 months later. Coolant was evaporating. I'd stick with the OEM in the future.
Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 333,000 miles
2015 Camry 40,000 miles

#4535285 - 10/06/17 10:32 AM Re: quality difference in radiator caps [Re: edwardh1]
JustinH Offline

Registered: 04/17/04
Posts: 5075
Loc: Texas
For a 7 dollar savings I would buy an OEM cap.

However I have never had a problem with a stant cap either.
'11 Hyundai Sonata GLS
'11 Scion XB

#4535294 - 10/06/17 10:44 AM Re: quality difference in radiator caps [Re: edwardh1]
JohnnyJohnson Offline

Registered: 10/22/09
Posts: 2112
Loc: Wet side WA
Well the cap on my Corolla is only 14 years old my guess is its going to last until the car stops running. But I did have to add a cup of coolant last year? Since then it hasn't dropped?
2004 Toyota Corolla 118565
Out: QSUD 5W-30 Purolator One 5030 mile OIC
In: Valvoline ML 5w-30 Fram TG4967 117530
2006 Duramax 73712

#4535301 - 10/06/17 10:56 AM Re: quality difference in radiator caps [Re: edwardh1]
doitmyself Offline

Registered: 06/03/02
Posts: 6124
Loc: MI
RE: finding OEM part number

Do the online OEM parts suppliers have the correct information regarding OEM part numbers?:

For instance, I plugged in 2004 Highlander at this site:;6=4FC;7=05S)

Maybe 16401-31520, $13.xx on Ebay delivered.

#4535315 - 10/06/17 11:21 AM Re: quality difference in radiator caps [Re: edwardh1]
Yah-Tah-Hey Offline

Registered: 05/26/14
Posts: 3097
Loc: Columbus,Nebraska
OEM all the way.

#4535336 - 10/06/17 11:41 AM Re: quality difference in radiator caps [Re: edwardh1]
Drew99GT Offline

Registered: 10/11/02
Posts: 22075
Loc: Colorado Springs
I've had a Stant on my Corolla for over 10 years; still works fine.

#4535359 - 10/06/17 12:03 PM Re: quality difference in radiator caps [Re: edwardh1]
nthach Offline

Registered: 01/02/04
Posts: 3496
Loc: California
For Japanese cars, Denso/T-Rad/Calsonic OEM no question. In some cases, a Stant/Gates does work fine. The old Nissan Quest my parents had sad a Stant cap until we unloaded it, it held up to pressure. A Subaru I worked on had a Stant instead of the OEM Calsonic and it worked fine. Toyota and Honda tend to be more finicky for caps.

The Americans use Stant or Indian-made TVS caps.

Amazon does sell fakes, but it's actually easy to tell a fake/real Denso apart.

#4535409 - 10/06/17 01:06 PM Re: quality difference in radiator caps [Re: edwardh1]
mechjames Offline

Registered: 01/16/08
Posts: 514
Loc: Richmond, BC, Canada
Stant and gates are the exact same part, they rebox each other.
I haven't had a problem with either of them.
86 Mustang 5.0L 170km - Amsoil XL 5w30 / Baldwin B2-HPG
14 Ram 1500 5.7 - Amsoil XL 5w20 / Baldwin B7443
98 Jeep ZJ 5.9 - Amsoil OE 10w30 / Baldwin B34

#4535430 - 10/06/17 01:54 PM Re: quality difference in radiator caps [Re: edwardh1]
Superflop Offline

Registered: 07/01/09
Posts: 369
Loc: Seattle
I buy motorad personally

Yeah the afore mentioned TVS brand is oem for a lot of makes

Edited by Superflop (10/06/17 01:57 PM)
2002 saab 9-5 2.3t wagon
2014 dodge grand caravan magnatec 5w-20

#4535443 - 10/06/17 02:12 PM Re: quality difference in radiator caps [Re: edwardh1]
THafeez Offline

Registered: 08/15/16
Posts: 650
Loc: New Jersey
2004 Toyota Solara SE 2.4 2AZFE
175,000 miles
Valvoline Synpower Maxlife 5W30
Royal Purple 20-400 oversize

#4535528 - 10/06/17 03:40 PM Re: quality difference in radiator caps [Re: edwardh1]
PandaBear Offline

Registered: 08/05/02
Posts: 14106
Loc: Silicon Valley
Stant makes for Gates on a lot of Japanese models.

Use OEM. My Stant cap stuck shut and caused a head warp / head gasket problem. I called them and they basically said they are only responsible for the cap cost and can send me a replacement cap. Don't take a chance for $10 saving like me.
"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah

#4535678 - 10/06/17 07:12 PM Re: quality difference in radiator caps [Re: edwardh1]
GMBoy Offline

Registered: 11/22/04
Posts: 7659
Loc: Texas
Stay away from GATES!!! I had 2 different failures on 2 different vehicles. First the caps are CHEAPLY made and do not fit correctly. Secondly - they will leak. Happened to me on 2 different applications: Honda Civic and Honda Accord. I'm glad I caught the issues before giving the car back to the owners. They literaly lasted just days!

#4535739 - 10/06/17 08:37 PM Re: quality difference in radiator caps [Re: edwardh1]
mclasser Offline

Registered: 04/13/13
Posts: 2122
Loc: The Northeast
OEM or bust. Not worth trying to save a few bucks on a part that can potentially overheat the engine.

When I changed my cap last year I went straight to the dealer parts counter.

Edited by mclasser (10/06/17 08:38 PM)
2018 Hyundai Elantra VE -- 1K
2013 Honda Pilot EX-L 4WD -- 50K
2002 Honda Accord EX-L -- 210K
2002 Infiniti I35 -- 130K

#4535745 - 10/06/17 08:43 PM Re: quality difference in radiator caps [Re: edwardh1]
Merkava_4 Offline

Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
I will never trust Stant again after I had one of their brand new thermostats that wouldn't open up in a pan of boiling water. Certain critical parts I'll stay with O.E.M.

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