PG55 NR358: Advanced Coolant for Cast-Iron & Diesel Engines Free U.S. Shipping from our California warehouseChoose 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)
