PEAK Universal 50/50: specs and approvals

Updated 22 October 2026 · Independent, sourced reference

Summary

PEAK Universal 50/50 coolant data, from PEAK's own source. PEAK Universal 50/50 Prediluted Antifreeze + Coolant is a 50/50 premix ethylene glycol-based coolant listed by Old World Industries. The manufacturer's page we checked does not list OEM spec codes. Stated service life: 10+ Years / 300,000 Miles.

Disclaimer: General information only, not professional advice. Always use the coolant specified in your vehicle owner's manual. Using the wrong coolant can damage an engine.
Independent and not affiliated. Coolant.com is not affiliated with, sponsored by or endorsed by any coolant or vehicle maker or retailer listed here, and we earn nothing from these links. Brand and spec names are used only to identify products. Every field comes from the manufacturer's own page or datasheet, checked 22 October 2026. "Not published" means we could not find it in that source. We record no prices.

Specifications

BrandPEAK
MakerOld World Industries
ProductPEAK Universal 50/50 Prediluted Antifreeze + Coolant
Part numbers (as published)PKU5D3
Sizes (as published)not published
Chemistrynot published
Base glycolEthylene glycol
Colournot published
Premix or concentratePremix 50/50
OEM / industry specs listednot published
ASTM standards listedASTM D3306, ASTM D4985
Service life claim10+ Years / 300,000 Miles
Freeze point (as published)-34°F
Free-of claimsnitrite-free, borate-free, silicate-free, phosphate-free, amine-free
Datasheetdatasheet
Sourcemanufacturer page
Last checked22 October 2026

Specs and approvals listed by the manufacturer

  • Meets ASTM D3306 per PEAK (industry test standard)
  • Meets ASTM D4985 per PEAK (industry test standard)

Manufacturer wording: Meets European phosphate-free and Japanese silicate-free requirements

"Meets X per manufacturer" is our shorthand for any of the manufacturer's own phrases: meets, meets or exceeds, approved, or recommended for applications requiring. It is the manufacturer's claim, not an approval by Coolant.com or by the vehicle maker. Codes are copied as published. Some sources list codes for compatibility rather than formal approval. The wording above shows which.

What the manufacturer says it is for

PEAK® Universal Antifreeze + Coolant is designed for use in all North American, Asian and European passenger cars, SUVs, motorcycles and light/medium duty trucks, regardless of make, model or year.

Quoted from the manufacturer's page. Coolant.com has not verified fitment for any vehicle, and a listed make or year range is the manufacturer's statement, not ours.

Compatibility notes

  • Sold premixed: pour as supplied. Do not add water unless the label says to.
Always check your owner's manual first. Use the coolant spec printed in your owner's manual or service information. A listing here is the manufacturer's own claim (meets, exceeds, approved or recommended, worded as they put it). It is not our approval and not a fitment guarantee for your vehicle. If in doubt, ask your dealer or a qualified mechanic.

Where to buy

We did not find a retailer link on the manufacturer's page that we could check. Try the manufacturer's own site: PEAK product page.

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Sources

  1. PEAK product page (status on 22 Oct 2026: 200)
  2. PEAK datasheet / spec sheet