Recent Topics
PUP amazon 5w-20
by Koncrete_Cam - 04/08/20 08:54 PM
Duralube Trans Shudder Fixx question
by soulburner - 04/08/20 08:36 PM
Number of Spare Magazines You Consider Adequate?
by 2015_PSD - 04/08/20 08:24 PM
Troy Bilt TB6044XP string trimmer dies when hot
by 92saturnsl2 - 04/08/20 07:18 PM
JD Yanmar deisel engine
by yankees1 - 04/08/20 07:14 PM
PQIA Looks at Leading 0W-20's
by Jackson_Slugger - 04/08/20 07:03 PM
Marine oil in a passenger car engine
by Thunderbolt - 04/08/20 06:50 PM
BG SAE 5W-30 Full Synthetic Engine Oil
by JonnySaab - 04/08/20 06:42 PM
Buying oil filters: anyone buy them online?
by 53' Stude - 04/08/20 06:03 PM
Rampage muscle truck
by gfh77665 - 04/08/20 05:57 PM
Why is exhaust stupid expensive?
by IMSA_Racing_Fan - 04/08/20 05:34 PM
Castrol magnatec 5 qts of 0w20 for $14.15
by YoungEngineer - 04/08/20 05:20 PM
New WEN 56225i First Oil Change 1 Hour
by gathermewool - 04/08/20 05:04 PM
Fast Food Specials Dissapeared
by 007 - 04/08/20 04:17 PM
Amber Alerts at 5am
by rekit - 04/08/20 03:16 PM
MC FL-910S cut open
by kstanf150 - 04/08/20 03:12 PM
Cartridge Weight Question
by Gebo - 04/08/20 02:54 PM
Auto insurance rate cut
by Wolf359 - 04/08/20 02:18 PM
Do you "correct" your service technician or not?
by SevenBizzos - 04/08/20 02:07 PM
How to keep glasses from fogging up?
by Chris142 - 04/08/20 01:58 PM
Newest Members
Hitmang77, mpstir, LMVLS1, Jotorobi, jhoffy22
71128 Registered Users
Who's Online Now
121 registered members (55hambone, 4WD, 2K2AcuraTL, 2015_PSD, 2009Edge, 53' Stude, 8 invisible), 2,473 guests, and 25 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics303,792
Posts5,242,020
Members71,128
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Page 2 of 2 1 2
Re: Coolant change time or mileage [Re: kschachn] #4883370 09/29/18 10:48 PM
Joined: Aug 2018
Posts: 948
O
Onetor Offline
Offline
O
Joined: Aug 2018
Posts: 948
Originally Posted by kschachn
Originally Posted by Onetor
Don't forget that coolant also lubricates the Water Pump etc. So the additives need to be replenished, etc. I agree about the heat being detrimental!

Which parts are lubricated by the coolant? The water pump bearings are actually protected from the coolant by seals. Once the seal deteriorates and is breached by the coolant the bearings will destruct in short order.


I stand corrected. Ty


N = R* x fp x ne x fl x fi x fc x L
Re: Coolant change time or mileage [Re: motor_oil_madman] #4884647 10/01/18 03:01 PM
Joined: Aug 2008
Posts: 25,020
StevieC Offline
Offline
Joined: Aug 2008
Posts: 25,020
I do radiator spill/fill's at 1/2 the allowable intervals that way the coolant in the system is always fresh all the time and there is no need for flush/fill. I have driven all my vehicles to their junk points with original water pumps and radiators.


'18 Caravan - 50k KM - AMSOIL SS 0w20, Fram Ultra, TC-W3 500:1
'06 Santa Fe - 535k KM (Retired)

There is no such thing as "lifetime" fluids! mad
Re: Coolant change time or mileage [Re: motor_oil_madman] #4891612 10/09/18 07:01 AM
Joined: Nov 2005
Posts: 3,388
M
mcrn Offline
Offline
M
Joined: Nov 2005
Posts: 3,388
I just went 6 yrs on my nissan with 75k miles....makes me feel bad I waited a yr too long,


2012 Nissan Rogue
Re: Coolant change time or mileage [Re: motor_oil_madman] #4908908 10/29/18 04:39 AM
Joined: Jul 2005
Posts: 34,146
D
demarpaint Offline
Offline
D
Joined: Jul 2005
Posts: 34,146
I go by time for the coolant. I'd never hit the mileage stated in the owners manual vs. the time in use for the coolant.


God Bless Our Troops

Re: Coolant change time or mileage [Re: motor_oil_madman] #5007523 02/11/19 12:05 AM
Joined: May 2013
Posts: 189
K
KevinP Offline
Offline
K
Joined: May 2013
Posts: 189
There are two concerns, coolant degradation as it acidifies with age, and inhibitor package depletion.

You can check how the glycol is aging with a pH meter (strips won't give you enough resolution). You should make sure your pH meter is calibrated against pH buffer standards because the probes quickly drift out of calibration, especially when they are not stored correctly. The pH should be around 8.0 in a healthy glycol solution for automotive use. And yes.... it ages quicker with heat. The degradation is a chemical reaction and ethylene glycol primarily degrades into glycolic acid (some oxalic, some formic) and all chemical reactions proceed quicker with energy input. Thus ethylene degrades into the acids quicker at higher temps than it would at lower.

I've also seen studies that show inhibitor degradation over time. The azoles, in particular, drop with time. I'm not sure of the mechanism whether it is bonded to copper/brass as the inhibiting layer or if it is lost in the non-sealed system. Either way, you could just start at a higher level. The assumption is that it will be run at 50/50 so run it at 65/35 so you have more to start with.

It is so cheap to dump it on a regular basis that I err on the side of caution.

Re: Coolant change time or mileage [Re: motor_oil_madman] #5130985 06/11/19 01:50 AM
Joined: Mar 2012
Posts: 1,032
T
tiger862 Offline
Offline
T
Joined: Mar 2012
Posts: 1,032
Thermostat and coolant every 5 years. Gives system a good drain and when bleeding the system out less chance of thermostat getting stuck.


Tiger862
2018 Grand Caravan
Page 2 of 2 1 2
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™