PEAK OET 50/50 North American Vehicles Yellow: specs and approvals

Updated 22 October 2026 · Independent, sourced reference

Summary

PEAK OET 50/50 North American Vehicles Yellow coolant data, from PEAK's own source. PEAK ORIGINAL EQUIPMENT TECHNOLOGY Antifreeze + Coolant 50/50 Prediluted for North American Vehicles - YELLOW is a 50/50 premix P-OAT ethylene glycol-based coolant listed by Old World Industries. The manufacturer lists 1 OEM or industry spec code, including WSS-M97B57-A1. Stated service life: 400,000 miles or 15 years.

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 ORIGINAL EQUIPMENT TECHNOLOGY Antifreeze + Coolant 50/50 Prediluted for North American Vehicles - YELLOW
Part numbers (as published)NAYB53
Sizes (as published)not published
ChemistryP-OAT
Base glycolEthylene glycol
ColourYellow
Premix or concentratePremix 50/50
OEM / industry specs listedWSS-M97B57-A1
ASTM standards listedASTM D3306, ASTM D4985
Service life claim400,000 miles or 15 years
Freeze point (as published)not published
Free-of claimsnitrite-free, borate-free, silicate-free, amine-free
Datasheetdatasheet
Sourcemanufacturer page
Last checked22 October 2026

Specs and approvals listed by the manufacturer

  • Meets WSS-M97B57-A1 per Antifreeze is glycol plus inhibitors. Choose it by your vehicle's specification. (Ford)
  • Meets ASTM D3306 per PEAK (industry test standard)
  • Meets ASTM D4985 per PEAK (industry test standard)

Manufacturer wording: It meets the performance requirements of Ford WSS-M97B57-A1, ASTM D3306 and D4985.

"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

Specifically designed for use in all North American vehicles requiring a YELLOW phosphate-enhanced organic acid technology (POAT) extended life antifreeze/coolant.

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

  • If your owner's manual calls for WSS-M97B57-A1, PEAK lists that code for this product. Read the exact wording above, and confirm against your manual.
  • Chemistry is listed as P-OAT. Mixing different chemistries can shorten coolant life. See OAT vs HOAT vs IAT and use the mixing checker before topping up.
  • Colour is listed as Yellow. Colour is a dye, not a spec, so two coolants of the same colour can be different chemistries. See coolant colours explained.
  • 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

  • amazon.com (listed on the manufacturer page; the retailer blocks automated checks)
  • autozone.com (listed on the manufacturer page; the retailer blocks automated checks)
  • farmandfleet.com (listed on the manufacturer page; the retailer blocks automated checks)

These links come from the manufacturer's own product page or official parts store. We do not show prices because they change and vary by store. Check that the part number and size match before you buy.

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Sources

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