PG55 NR358 | Free Shipping from two bottles

PG55 NR358: Advanced Coolant for Cast-Iron & Diesel Engines

Free U.S. Shipping from our California warehouse
Choose from 2-, 4-, or 6-bottle kits at our best unit price. Only $70.99 per bottle.

Antifreeze Type: Golden Ratio Prediluted (55:45)

Durable Cooling for Heavy-Duty Applications

PG55 NR358 is engineered for cast-iron blocks and diesel engines, providing excellent heat control, corrosion resistance, and long service life. Built on the proven 55:45 approach, PG55 NR358 combines:

• 55% propylene glycol
• 40% high-precision filtered water
• 5% inhibitors / anti-foam additives

Learn why the “Golden Ratio” matters

Why Choose PG55 NR358?

• Cast-Iron & Diesel Focus – Tuned for high-compression diesel and classic iron blocks
• Superior Corrosion Protection – 5% additive package helps prevent rust, scale, and cavitation
• Thermal Stability – Holds temps under towing, off-road, and long-haul conditions
• Eco-Friendlier Base – Non-toxic, biodegradable propylene glycol

Applications

• Heavy-Duty & Overland: RAM 2500, Ford F-250, Land Cruiser diesel, Patrol diesel
• Diesel Platforms: Light-duty to medium-duty high-compression engines
• Classic Cast-Iron Gas: RB26, 2JZ, 3S-GTE, 4G63, 426 HEMI, 428 Cobra Jet
• Industrial: Generators, farm machinery, cast-iron equipment

Technical Specifications

• Compatibility: Diesel & cast-iron engines; also suitable for gasoline engines
• Boiling Point: 224.6 °F (107 °C)
• Antifreeze Protection: Down to −40 °F (−40 °C)
• Replacement Interval: ~2 years (heavy-duty); up to 5 years (standard use)
• Volume: 4 liters (1.056 gallons)
• Color: Blue
• Type: Ready-to-use (do not dilute or mix with other coolants)

Usage Note — For Maximum Protection

Before filling with PG55 NR358, flush the system to remove residues:

• Rinse the system twice with clean distilled or de-ionized water, and
• Ensure any ethylene-glycol coolant is fully removed.

If your system already contains PG55 NR358, flushing is not required for continuous use.

Pricing (Free U.S. Shipping)

• 2 Bottles (8 L): $141.98 ($70.99 each)
• 4 Bottles (16 L): $283.96 ($70.99 each)
• 6 Bottles (24 L): $425.94 ($70.99 each)

Notes

• Ships from California via USPS / UPS Ground
• Available in even-quantity bundles (2-pack, 4-pack, 6-pack)

Click here to download the SDS (Safety Data Sheet)