Kubota Coolant Cross-Reference Guide (2026)

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⚡ Quick Answer

Genuine Kubota coolant is a phosphate-containing, silicate-free, nitrite-free ethylene glycol antifreeze — OEM part numbers 70040-0L014 (1-gallon concentrate, ~$21) and 77700-06325 (1-gallon 50/50 premix, ~$17). No widely-available aftermarket product is documented as an exact chemistry match — the commonly recommended “Zerex G-05” is actually phosphate-free, the opposite of what Kubota specifies. Prestone and Valvoline’s Asian-vehicle coolants are reasonable substitutes, but always flush completely first and never mix chemistries.

⚠️ Correction notice: An earlier version of this guide listed incorrect OEM part numbers, inflated capacities, and recommended Zerex G-05 as a close Kubota chemistry match. Zerex G-05 is phosphate-free — Kubota coolant is phosphate-containing. This page has been corrected with verified part numbers, capacities, and honest product labeling.

💡 What Color is Kubota Coolant?

Genuine Kubota coolant is blue-green in color. Bright green is traditional IAT — not compatible. Orange or red is Dex-Cool/OAT — never use in a Kubota. Color is a helpful visual cue but always confirm chemistry on the label rather than relying on color alone.

Genuine Kubota Coolant: Correct Part Numbers & Pricing

Verified OEM Products

70040-0L014 — Kubota Extended Life Antifreeze, 100% concentrate, 1 gallon (~$21.40)
77700-06325 — Kubota Genuine 50/50 Mix Coolant, ready-to-use premix, 1 gallon (~$17.08)
Chemistry: Ethylene glycol-based, phosphate-containing, silicate-free, no borates or nitrites
Availability: Sold through Kubota dealers — not currently available on Amazon

The concentrate makes roughly two gallons of finished 50/50 coolant per bottle; the premix is ready to pour but yields only one gallon of finished coolant per bottle. Compare on a like-for-like basis — concentrate to concentrate, premix to premix — not sticker price to sticker price.

Why Zerex G-05 Is NOT a Kubota Match

Zerex G-05 shows up as a recommended Kubota coolant in a lot of places online — including an earlier version of this page. It’s worth being direct about why that’s wrong: Zerex G-05 is manufacturer-described as a phosphate-free, low-silicate HOAT formula. Kubota’s genuine coolant is documented as phosphate-containing and silicate-free. Those are opposite inhibitor packages, not a close match.

Don’t use Zerex G-05 as a Kubota substitute. If you’ve already been running it, it’s worth a complete flush and switch to genuine coolant or one of the Asian-vehicle products below.

Reasonable Aftermarket Substitutes (Honestly Labeled)

None of the products below carry a documented Kubota approval or a confirmed inhibitor-by-inhibitor match. They’re marketed for Asian-vehicle or universal aluminum-engine applications — a reasonable substitute for many owners, but treat them as “Asian-vehicle coolant,” not “verified Kubota-equivalent.” Always do a complete distilled-water flush before switching to any of these from genuine coolant or another chemistry.

🌡️ Asian-Vehicle & Universal Coolant Options

Prestone Asian Vehicle / Platinum Asian Blue (50/50 Premix)

Marketed for Asian vehicles; not a confirmed Kubota approval — ready to use, no mixing

View on Amazon

Valvoline Zerex Asian Vehicle Blue (50/50 Premix)

Formulated for Japanese/Korean vehicles; not a confirmed Kubota approval — ready to use

View on Amazon

Peak Global Lifetime (Concentrate)

Organic-acid technology, silicate-free; universal application, not phosphate-confirmed — mix 50/50 with distilled water

View on Amazon

Prestone Extended Life / Universal (Concentrate)

Widely available universal HOAT coolant — mix 50/50 with distilled water

View on Amazon

Prestone Extended Life / Universal (50/50 Premix)

Same formula, ready to use — no mixing required

View on Amazon

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Verified Coolant Capacities by Model

Model	Verified Coolant Capacity
BX1880	3.06 qt / 2.9 L
BX2380	3.3 qt / 3.1 L (includes recovery tank)
B2601	4.0 qt / 3.8 L (includes recovery tank)
L2501	6.3 qt / 6.0 L
L3301 / L3901	6.3 qt / 6.0 L
M5-111	11.0 qt / 10.0 L, plus 1.1 qt / 1.0 L recovery tank (separate)
M7060	8.5 qt / 8.0 L, plus 1.1 qt / 1.0 L recovery tank (separate)

For models not listed here (BX2680, BX23S, B2301, B2650, B3350, L4701, M6-141, and others), always confirm the exact coolant capacity in your operator’s manual — capacities vary meaningfully between similar-looking models, and recovery-tank capacity is sometimes listed separately from main system capacity.

OEM vs Aftermarket — Real Cost Comparison

Comparing Kubota’s genuine 50/50 premix (77700-06325, ~$17.08/gal) against Prestone Extended Life 50/50 premix (~$9.98/gal) gives a real, verified difference of about $7.10 per gallon. Scaled to full-capacity fills, rounded up to whole gallon jugs:

Model	Genuine Kubota (premix)	Prestone (premix)	Savings
BX1880 / BX2380 / B2601	1 gal — $17.08	1 gal — $9.98	~$7.10
L2501 / L3301 / L3901	2 gal — $34.16	2 gal — $19.96	~$14.20
M5-111 / M7060	3 gal — $51.24	3 gal — $29.94	~$21.30

This is a real, verified comparison — not an estimate. Prices as of this writing; check current pricing before purchasing, as retailer prices change.

The most important thing when choosing Kubota coolant is matching the chemistry — phosphate-containing, silicate-free — not chasing the biggest “savings” number. Genuine Kubota coolant (70040-0L014 or 77700-06325) is the only option with a confirmed exact match. If you’re going aftermarket, Prestone and Valvoline’s Asian-vehicle products are reasonable substitutes, but always flush completely first and never mix chemistries. For complete mix ratios see our Kubota Coolant Type Guide. For more DIY guides visit TractorPartsCentral.com.

? Frequently Asked Questions

What is the correct Kubota coolant part number?

Genuine Kubota Extended Life Antifreeze is part number 70040-0L014 (1-gallon 100% concentrate, ~$21.40). Kubota also sells a ready-to-use 50/50 premix under part number 77700-06325 (~$17.08/gallon). Both are phosphate-containing, silicate-free ethylene glycol coolant sold through Kubota dealers.

What color is Kubota antifreeze?

Genuine Kubota coolant is blue-green. Bright green is traditional IAT — not compatible. Orange or red is Dex-Cool/OAT chemistry — never use in a Kubota. Color is a helpful visual cue but always confirm chemistry on the label rather than relying on color alone.

Is Zerex G-05 a good Kubota coolant substitute?

No. Zerex G-05 is a phosphate-free HOAT formula. Kubota’s genuine coolant is phosphate-containing. These are different inhibitor chemistries, not a close match, despite this pairing being commonly recommended online. Choose a phosphate-containing Asian-vehicle coolant or genuine Kubota product instead.

What happens if I use the wrong coolant in a Kubota?

Mixing incompatible chemistries — like Dex-Cool OAT with phosphate-containing coolant — can create gel-like sludge that clogs radiators and heater cores, reducing heat transfer and causing overheating. If the wrong coolant was used, drain completely, flush with distilled water, and refill with a confirmed-compatible product.

How much coolant does my Kubota hold?

It varies significantly by model — a BX2380 holds about 3.3 quarts while an M5-111 holds about 11 quarts plus a separate recovery tank. Always check your operator’s manual for your exact model, since even similar-looking models can differ meaningfully in capacity.

Related Kubota Cooling System Guides

Kubota Coolant Type Guide →

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Kubota Antifreeze Cross-Reference Guide →

Full brand equivalence table with honest chemistry notes

Kubota Tractor Overheating Guide →

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Kubota Fluid Capacity Chart →

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Free Kubota Parts Diagrams & Manuals →

Cooling system diagrams and parts lookup for all series

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