Fleet Maintenance - 25

VehicleServicePros.com/10095215

New coolant additive to address
changing engine designs
The nitrite-free formula
eliminates damaging
corrosion of aluminum
parts in lightweight
engine designs.
By Colin Dilley Ph.D., vice
president of technology,
Prestone Products Group
The decision by engine manufacturers to use lighter materials,
such as aluminum, created
many positive implications
for the heavy duty vehicle
market. Chief among them
is improved fuel economy,
reduced emissions, and the
ability to haul heavier loads.
With these overall positives came
one significant roadblock: traditional
heavy duty antifreeze/coolants

(AF/C) designed for engines constructed of cast iron, copper, or
brass did not necessarily play well
with aluminum. The culprit was
a new heat-exchange manufacturing process called controlled
atmosphere brazing (CAB). CAB
improves the efficiency of the heat
exchanger manufacturing process,
but it leaves behind some amount
of residual brazing flux, which can
react with certain AF/C inhibitors.
The particular issue is with the inhibitor nitrite, which is used to protect
liners from cavitation damage.
To ensure complete protection,
Prestone has responded to this
challenge with the development
of a new nitrite-free organic acid
technology (NF OAT) AF/C with a
proprietary inhibitor package. Called
Cor-Guard, this additive can effectively eliminate the negative effects
of the CAB manufacturing process.
Cor-Guard enables the NF OAT AF/C
to instantly bond to the cooling-sys-

tem components, significantly
lowering the level of surface-area
corrosion and erosion below that
of other similar AF/C fluids. This
new formulation is also designed
to seek out and protect hot spots
from cavitation corrosion, which are
notorious points for engine damage.
Additional benefits include:
* Improved cavitation control
* Improved compatibility with
the elastomers in cooling-system seals and gaskets
* Improved AF/C formula stability
for improved overall performance
* Maintains proper engine temperatures helping preserve oil viscosity,
which improves engine life and
performance with optimized MPGs
* Improved coolant stability
for older AF/C that is topped
off with Cor-Guard
Since different engine manufacturers have varying specifications for
AF/C selection and usage, before

ยป Prestone's NF OAT antifreeze/
coolant features an inhibitor
package to protect against
corrosion of aluminum parts.
Photo courtesy of Prestone Products Group

using Prestone Command with CorGuard, it is critical that fleets ensure
the cooling system is properly prepared for the product. It is always
advisable to follow the preferred
maintenance practices of the OEM
when it comes to selecting an AF/C.

December 2019 | VehicleServicePros.com

25


http://www.ipatools.com http://www.VehicleServicePros.com/10095215 http://www.VehicleServicePros.com

Fleet Maintenance

Table of Contents for the Digital Edition of Fleet Maintenance

Uptime: Top Industry Trends in 2020 and Beyond
How Active Safety Systems Pave the Way to Vehicle Autonomy
Vehicles: Steps to Understand and Prevent Corrosion
In the Bay: Remote Vehicle Management Enters a New Phase
Shop Operations: How to Prevent, Contain, and Clean Up Shop Spills
Management: A Guide to World-Class Maintenance
Training: What is a Bistable Relay?
Reman, Rebuild, Replace: What's the Difference Between a Supplier and a Supply Partner?
Diagnostics: Four Steps of an Effective Maintenance Program
Fleet Parts & Components
Tools & Equipment
Classifieds
Guest Editorial: Trends in Asset Telematics
Fleet Maintenance - 1
Fleet Maintenance - 2
Fleet Maintenance - 3
Fleet Maintenance - 4
Fleet Maintenance - 5
Fleet Maintenance - 6
Fleet Maintenance - 7
Fleet Maintenance - Uptime: Top Industry Trends in 2020 and Beyond
Fleet Maintenance - 9
Fleet Maintenance - How Active Safety Systems Pave the Way to Vehicle Autonomy
Fleet Maintenance - 11
Fleet Maintenance - 12
Fleet Maintenance - 13
Fleet Maintenance - 14
Fleet Maintenance - 15
Fleet Maintenance - 16
Fleet Maintenance - 17
Fleet Maintenance - 18
Fleet Maintenance - 19
Fleet Maintenance - Vehicles: Steps to Understand and Prevent Corrosion
Fleet Maintenance - 21
Fleet Maintenance - 22
Fleet Maintenance - 23
Fleet Maintenance - 24
Fleet Maintenance - 25
Fleet Maintenance - 26
Fleet Maintenance - 27
Fleet Maintenance - 28
Fleet Maintenance - 29
Fleet Maintenance - In the Bay: Remote Vehicle Management Enters a New Phase
Fleet Maintenance - 31
Fleet Maintenance - 32
Fleet Maintenance - 33
Fleet Maintenance - 34
Fleet Maintenance - 35
Fleet Maintenance - Shop Operations: How to Prevent, Contain, and Clean Up Shop Spills
Fleet Maintenance - 37
Fleet Maintenance - 38
Fleet Maintenance - 39
Fleet Maintenance - 40
Fleet Maintenance - 41
Fleet Maintenance - Management: A Guide to World-Class Maintenance
Fleet Maintenance - 43
Fleet Maintenance - Training: What is a Bistable Relay?
Fleet Maintenance - 45
Fleet Maintenance - Reman, Rebuild, Replace: What's the Difference Between a Supplier and a Supply Partner?
Fleet Maintenance - 47
Fleet Maintenance - Diagnostics: Four Steps of an Effective Maintenance Program
Fleet Maintenance - 49
Fleet Maintenance - 50
Fleet Maintenance - 51
Fleet Maintenance - Fleet Parts & Components
Fleet Maintenance - 53
Fleet Maintenance - 54
Fleet Maintenance - 55
Fleet Maintenance - 56
Fleet Maintenance - 57
Fleet Maintenance - 58
Fleet Maintenance - Tools & Equipment
Fleet Maintenance - 60
Fleet Maintenance - 61
Fleet Maintenance - 62
Fleet Maintenance - Classifieds
Fleet Maintenance - 64
Fleet Maintenance - 65
Fleet Maintenance - Guest Editorial: Trends in Asset Telematics
Fleet Maintenance - 67
Fleet Maintenance - 68
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