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2015 Toyota Highlander V6 100k miles #5260330 11/06/19 09:53 PM
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Posts: 134
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RN89 Offline OP
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Hello Bitogers, I'm needing some quality advice on what I need to do. Our 2015 V6 Toyota Highlander just turned 100,000 miles. I have had no issues with it whatsoever - not one. Other than replacing tires and engine oil, the thing has been flawless.

This is where my questions being. I am getting so many different opinions on what fluids need to be changed out and when? Coolant? Brake fluid? trans fluid? diff fluid? The Toyota schedule is telling me one thing (coolant) and the dealer something else (trans, brake, coolant) and the Facebook forum is scattered with differing opinions on what fluids need to be changed. Theres the "lifetime" fluids club, the 30k fluids club, and the who cares as long as its running club.

My wife and I have no plans on getting rid of this car anytime soon. We love it and it serves our family of 4 perfectly. I will say this, I currently do not have time with graduate school and two kids under 4, nor an interest in doing it myself - will be done either at dealer or independent shop. What should I do? Which fluids?

Thanks in advance for your help and quality advice!


2015 Toyota Highlander - 100K miles
2014 Toyota Tundra - 40k miles
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260334 11/06/19 09:57 PM
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HoosierJeeper Offline
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Not a Toyota expert at all but here are my thoughts:
Coolant - probably okay. I think most anything now (at least my newer Jeeps) use 10yr/150k mile coolant. There's a decent chance within the next 50k you might want to do the water pump or radiator or tstat, so I'd leave that.
Diffs (if AWD) - probably.
Trans - probably.
Brakes - some peoples heads will explode, but I've never done a complete brake fluid flush on anything I've owned, just bleeding as I've replaced components.


19 Jeep Renegade Trailhawk 1.3T
15 Jeep Cherokee Limited V6
07 Land Rover LR3 SE V8
05 Jeep Liberty Limited V6
96 Jeep Cherokee Country 4.0
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260335 11/06/19 09:58 PM
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Chris142 Offline
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Trans fluid for sure.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260347 11/06/19 10:25 PM
Joined: Mar 2015
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bbhero Online Content
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Has far as coolant replacement goes...

Take a look at the Peak 10x antifreeze coolant... Not a dex clone or dexcool.. No 2h-ea at all in it at all... Meets the Japanese standards for most Asian vehicles... And last for 300,000 miles...

That coolant may well be a perfect possibility for your Toyota. Just check your owners manual to truly make sure.

Last edited by bbhero; 11/06/19 10:26 PM.

Nissan Altima 3.5 Coupe
Cam2 Dexos1 Gen 2 5w30 Wix 57356 Oil filter
"Treat your family like your friends and treat your friends like your family."
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260354 11/06/19 10:43 PM
Joined: Oct 2009
Posts: 5,503
JohnnyJohnson Online Content
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If you've been doing your 30k 60K 90K maintenance and you don't have time just take it in at the next service interval.


2004 Corolla 137003
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 76800
Out: T6 5W-40 XG9100 73705
In: Rotella Dino PH9100 11-3-19
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260356 11/06/19 10:45 PM
Joined: Sep 2007
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JMJNet Offline
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x2 on the trans.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: 2015 Toyota Highlander V6 100k miles [Re: JohnnyJohnson] #5260381 11/06/19 11:32 PM
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Mad_Hatter Offline
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Originally Posted by JohnnyJohnson
If you've been doing your 30k 60K 90K maintenance and you don't have time just take it in at the next service interval.

+1

OP..unless there's something going on like a leak or what not, shut out the noise from FB and even the dealership. Follow the owners manual, they built the darn thing. This will give you the best chances of getting the most out of the vehicle.😉

Last edited by Mad_Hatter; 11/06/19 11:34 PM.
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260385 11/06/19 11:40 PM
Joined: Nov 2004
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cos Offline
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ATF - at least a drain 'n fill.
Brake fluid - change it! It's a safety issue.
Coolant - drain 'n fill.
Diffs and transfer case fluids - change 'em.
Power steering fluid - at least a drain 'n fill.


'15 Cadillac SRX
- Castrol Magnatec 5W30
- Valvoline Maxlife ATF





Re: 2015 Toyota Highlander V6 100k miles [Re: cos] #5260391 11/06/19 11:57 PM
Joined: Jun 2015
Posts: 495
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madeej11 Offline
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Originally Posted by cos
ATF - at least a drain 'n fill.
Brake fluid - change it! It's a safety issue.
Coolant - drain 'n fill.
Diffs and transfer case fluids - change 'em.
Power steering fluid - at least a drain 'n fill.

This is exactly what I would do. Solid advice.

Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260420 11/07/19 04:46 AM
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MoneyJohn Offline
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If you have a manual, go through it. If not, here is the link https://www.toyota.com/t3Portal/document/om-s/OM48E98U/pdf/OM48E98U.pdf

It also depends on what maintenance you have done so far. I agree with @cos that is the least I would do.

With regards to brake fluid, I change it every 4 years because this is hygroscopic whether it is required or not. It costs about $100, that's definitely worth peace of mind.

Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260476 11/07/19 06:57 AM
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MaximaGuy Offline
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Don't trust the forum folks who take of OTC coolants - it is a very dangerous and expensive game to play.
I have learned one thing never ever mess around in the coolant department - period. Everything else there is a give

Drain the coolant from the radiator and refill OEM coolant
Brakes are a must and replacing the fluid all across
PS flush is a must
OEM ATF flush is a must
Plugs are around the corner


2018 MB GLE350
2011 Lexus ES350
2006 Toyota Highlander 4WD
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260477 11/07/19 06:57 AM
Joined: Aug 2013
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HangFire Offline
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I agree with cos and madeej11. Do it all, unless it was just done on the 90K service, and you'll be good for another 100K miles.


Various musings: http://hangfire.net
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260478 11/07/19 06:58 AM
Joined: Sep 2002
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Gebo Offline
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As a Toyota "expert", at least in ownership, here are my recommendations.

The cars I own were all purchased "til death do us part." Remember this in my recommendations.
This point of view changes my maintenance schedule as I have no plans to ever sell any of them.
I've had Toyotas since 1983 when I purchased the only new car I ever owned, a Toyota Camry so "we" have a history.



Find a local Toyota mechanic. I use a Toyota mechanic that does my work at his home.
Toyota by day, self employed by night. He charges me $50/hr. We only use Toyota OEM parts.

Change the coolant and only use Toyota pink cap (it's early at 100K but I don't care)
Change the differentials gear oil. I use Amsoil but any synthetic would be fine.
Change the transfer case but it takes a special oil. Use Toyota only to be safe.
I would change the brake fluid as it has been about 5 years.
Change Power Steering Fluid. I use Toyota Dexron III in all mine but that's not the law.

As far as the Transmission, that can be a little delicate. Do you have an ATF dipstick where you can check the fluid level?
My son's '09 Highlander has a dipstick and it is a breeze to do a drain and fill.
If your transmission is sealed, you need someone who knows what he is doing to change it. But it must
be changed with only Toyota WS fluid. Don't believe what many will tell you about using a Multi-Vehicle ATF.

I am an adamant, die hard, cigar chewing, donkey kicking proponent of using only Toyota Coolant and Toyota ATF.


From this point on, I would change the coolant and ATF (drain and fill) every 30k, gear oils every 50k, brake fluid
and power steering fluid every 3 year. Lube your driveshaft every oil change.

What has been your oil change interval?


'98 LEX LS400 300K
'02 4Runner 245K
'05 Lex LS430 85K
'07 Lex GX470 65K

Shell Gas and Truck & Pennzoil Full Syn HM
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260482 11/07/19 07:02 AM
Joined: Sep 2003
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MaximaGuy Offline
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I have Toyo and Lexus - the manual says replace brake fluid every 24mo on Lexus and not Toyota.
Brake fluids need replacement every 24mo


2018 MB GLE350
2011 Lexus ES350
2006 Toyota Highlander 4WD
Re: 2015 Toyota Highlander V6 100k miles [Re: RN89] #5260513 11/07/19 07:47 AM
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WyrTwister Offline
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I would consider changing them all , one at a time if you need to stretch it out some . Does the transmission fluid smell burnt / bad ?


Wyr
God bless
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