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Early change of Dexron HP fluid on a Chevy Bolt? #4492394
08/18/17 10:59 PM
08/18/17 10:59 PM
Joined: Jan 2009
Posts: 365
So. Cal.
kohnen Offline OP
kohnen  Offline OP
Joined: Jan 2009
Posts: 365
So. Cal.
Gents,

I went and bought a Chevy Bolt. This is GM's all electric car (238 miles range).

It's transmission couldn't be simpler. It just a 2-stage helical reduction gear set, reducing the electric motor's output by a ratio of 7.05 to 1.

GM uses Dexron HP* ("High Performance," backward compatible with Dexron VI and Dexron III), about 3 liters.

The fluid is, as far as I can tell, what's used to cool the motor and lubricate the gears, bearings, and differential. It's supposed to be "lifetime" fluid. There are no clutches in the transmission, it's just all gears.

I've had Priuses in the past - they have a similar setup - gears and an electric motor, no clutches. The Prius uses Toyota's WS transmission fluid, and Toyota also says it's "lifetime" fluid. With the Prius, it's a good idea to replace the transmission fluid, as used fluid analyses have shown the fluid to be in bad shape at about ~30,000 miles. After this change, it appears the next fill is good for "lifetime."

So, what say you? Should I replace the Dexron HP fluid once early on? Will doing so get rid of metal shavings that occur during the break-in of the gear set? Or, has BITOG gotten under my skin, and should I just leave well-enough alone?

Love to know your thoughts!


* It appears that Dexron HP is a Full-Synthetic (in the German sense of the definition).


2017 Chevy Bolt
2015 Chevy Volt
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: kohnen] #4492402
08/18/17 11:09 PM
08/18/17 11:09 PM
Joined: Jun 2002
Posts: 19,236
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,236
Iowegia - USA
For that system, changing at 10,000 miles might be good idea but I doubt this simple system will have much debris in it.

And yes, Dexron HP is a true synthetic.


Reading is fundamental; understanding is not a given ability.
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: kohnen] #4492406
08/18/17 11:12 PM
08/18/17 11:12 PM
Joined: Dec 2006
Posts: 919
midwest
JamesBond Offline
JamesBond  Offline
Joined: Dec 2006
Posts: 919
midwest
Sure, why not? What other serviceable fluids does this thing even have? Brake fluid? You've got to have some sort of maintenance to keep you busy, otherwise you'll tun into one of those detailing people.

Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: JamesBond] #4492411
08/18/17 11:18 PM
08/18/17 11:18 PM
Joined: Jan 2009
Posts: 365
So. Cal.
kohnen Offline OP
kohnen  Offline OP
Joined: Jan 2009
Posts: 365
So. Cal.
Originally Posted By: JamesBond
Sure, why not? What other serviceable fluids does this thing even have? Brake fluid? You've got to have some sort of maintenance to keep you busy, otherwise you'll tun into one of those detailing people.


Yeah. It's NOT the ideal car for a BITOG member. I now only have one car with an engine (Chevy Volt) and we use the engine so little that I have to change the oil and filter every 2 years. Since I don't need several gallons of (really good) oil, I'll be giving most of my stash of motor oil to relatives.

It's got 3 cooling loops (passenger cabin, battery, and electronics / transmission). These cooling loops all use Dexcool / Pure Water in a 50/50 mix. It also uses DOT 3 for the brakes, but the actual disc brakes are almost never used. No brake fluid changes are on the maintenance schedule.

Aside from 7,500 mile tire rotation, the only maintenance item until 150,000 miles is the cabin air filter - every 22,500 miles or 2 years, whichever comes first.


2017 Chevy Bolt
2015 Chevy Volt
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: kohnen] #4492414
08/18/17 11:25 PM
08/18/17 11:25 PM
Joined: Mar 2008
Posts: 6,834
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 6,834
USA
Where do you even get Dexron HP? crzy

Maxlife doesn't claim HP yet banana

Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: slacktide_bitog] #4492422
08/18/17 11:35 PM
08/18/17 11:35 PM
Joined: Jan 2009
Posts: 365
So. Cal.
kohnen Offline OP
kohnen  Offline OP
Joined: Jan 2009
Posts: 365
So. Cal.
Originally Posted By: slacktide_bitog
Where do you even get Dexron HP? crzy

Maxlife doesn't claim HP yet banana


GM part number 19300536
AC Delco 10-4093
Mobil 1 Synthetic LV ATF HP

http://www.wholesalegmpartsonline.com/products/FLUID-Vehicle-Maintenance/10498188/19300536.html
https://www.mobil.com/English-US/Passenger-Vehicle-Lube/pds/GLXXMobil-1-Sythetic-LV-ATF-HP?p=1

So, the fluid is out there. It's not unique to the Bolt.


2017 Chevy Bolt
2015 Chevy Volt
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: kohnen] #4492566
08/19/17 07:44 AM
08/19/17 07:44 AM
Joined: Feb 2013
Posts: 3,117
Virginia
bigt61 Offline
bigt61  Offline
Joined: Feb 2013
Posts: 3,117
Virginia
Leave it alone and follow the owners manual.


92 Suburban 2500 7.4L 58k M1_0w40 5yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 5yr OCI
13 Dodge Dart 2.0L 30k PP 0w20 OLM OCI
70 Camaro 5.7L 59k
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: kohnen] #4492607
08/19/17 08:29 AM
08/19/17 08:29 AM
Joined: Jun 2003
Posts: 33,104
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,104
ME
Back in the day saturn used to say change the dexron in their stick shift cars once at 6000 miles to get rid of break in debris then never again.

I would be 100% sure to get the genuine GM part in case there are subtle electrical characteristics the aftermarket gets wrongly.

Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: eljefino] #4492729
08/19/17 10:50 AM
08/19/17 10:50 AM
Joined: Nov 2008
Posts: 3,157
Oshawa, Ontario Canada
JC1 Offline
JC1  Offline
Joined: Nov 2008
Posts: 3,157
Oshawa, Ontario Canada
Originally Posted By: eljefino
Back in the day saturn used to say change the dexron in their stick shift cars once at 6000 miles to get rid of break in debris then never again.

I would be 100% sure to get the genuine GM part in case there are subtle electrical characteristics the aftermarket gets wrongly.


+1.


2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: kohnen] #4493287
08/19/17 11:10 PM
08/19/17 11:10 PM
Joined: May 2017
Posts: 146
New York Queens
Ram02 Offline
Ram02  Offline
Joined: May 2017
Posts: 146
New York Queens
Lifetime fluid leave it alone


2013 Malibu 2LT M1 5w30
2013 Accord Sport M1 AP 0w20
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: Ram02] #4493288
08/19/17 11:12 PM
08/19/17 11:12 PM
Joined: Nov 2008
Posts: 9,046
Phoenix
dishdude Offline
dishdude  Offline
Joined: Nov 2008
Posts: 9,046
Phoenix
Originally Posted By: Ram02
Lifetime fluid leave it alone


Agreed, maybe 10 years/100k change it.


2018 Challenger SRT
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: eljefino] #4494078
08/20/17 10:30 PM
08/20/17 10:30 PM
Joined: Jan 2009
Posts: 365
So. Cal.
kohnen Offline OP
kohnen  Offline OP
Joined: Jan 2009
Posts: 365
So. Cal.
Originally Posted By: eljefino
...I would be 100% sure to get the genuine GM part in case there are subtle electrical characteristics the aftermarket gets wrongly.

Dexron HP is the GM spec. The only fluids I've seen that meet it is AC Delco, and one made by Mobil.


2017 Chevy Bolt
2015 Chevy Volt
Re: Early change of Dexron HP fluid on a Chevy Bolt? [Re: kohnen] #4495184
08/22/17 12:45 PM
08/22/17 12:45 PM
Joined: Jan 2004
Posts: 4,155
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,155
California
I'd dump the ATF before the 30K mark and make it a habit to change out every 30K then unless there's proof DexHP does hold up reasonably well.


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