Treatment for Extended-Life Coolants

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Penray has introduced Pencool 4000, an additive specifically formulated for nitrite-free extended-life coolants (ELCs) used in heavy-duty commercial applications. The new blend is compatible with all ELCs, including those families of Organic Acid Technology (OAT) and Nitrited Organic Acid Technology (NOAT) coolants.  Pencool 4000 provides important corrosion inhibitors in order to enhance and maintain the effectiveness and service life of these coolants.

The product can also be used as a water-only ELC corrosion inhibitor for marine applications.

The formulation adds specific benefits to ELCs used in commercial and heavy-duty vehicles and equipment by providing corrosion protection and extending the coolant’s service life. In doing so, it increases uptime, reduces maintenance costs, and helps to extend the life of the vehicle by reducing engine wear, says Penray.

Nitrite-free, Pencool 4000 provides protection to all metals typically wetted by coolant, including steel, cast iron, copper, and aluminum, as well as seals and elastomers found in cooling-system hoses. It contains special additives that protect against wet-sleeve liner pitting, reducing long-term maintenance costs. It also helps reduce cavitation erosion, the company says, which can compromise cooling system efficiency and cause hot spots that may result in engine damage.

Pencool 4000 is suited to over-the-road trucks and local delivery vehicles, as well as mobile off-highway vehicles and construction equipment.

The term ‘extended life coolant’ might be interpreted to mean that such products never wear out, but that’s not the case, notes Penray. While they do last longer than conventional coolants, supplementation with a product like Pencool 4000 is important to maximize their extended service life.

Penray recommends periodic coolant testing to monitor the condition and effectiveness of the corrosion inhibitors used in heavy-duty cooling systems.

Pencool 4000 is supplied in 16-ounce bottles as well as in 5-gallon pails and 55-gallon drums.

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Rolf Lockwood is editor emeritus of Today's Trucking and a regular contributor to

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