Who makes Pro Honda engine oil?

Pro Honda engine oils are manufactured for American Honda by Idemitsu Lubricants America, a subsidiary of Japan’s Idemitsu Kosan. Honda specifies the formulations and performance standards, and Idemitsu blends and packages the products—such as GN4, HP4, and HP4S—primarily for the North American market. In some regions or for certain Honda-branded automotive oils, Honda may use additional contract blenders, but Pro Honda motorcycle oils in North America are widely produced by Idemitsu.

What “made by” means for Pro Honda

Pro Honda is Honda’s in-house brand for motorcycle and powersports lubricants. While the bottles are labeled and distributed by American Honda Motor Co., the actual blending, additive integration, and packaging are handled by a contract lubricant manufacturer. For North America, that manufacturer is Idemitsu Lubricants America (ILA), part of Idemitsu Kosan—one of the world’s largest base oil producers and an established OEM supplier.

Evidence that Idemitsu makes Pro Honda oils

Multiple publicly available documents and product indicators point to Idemitsu as the producer. Here are the most consistent markers consumers and technicians reference when identifying the blender behind private‑label oils:

• Safety Data Sheets (SDS) for Pro Honda GN4, HP4, and HP4S commonly list Idemitsu Lubricants America as the manufacturer/preparer, with U.S. contact details tied to ILA.
• Packaging cues, such as “Made in USA” with lot codes and addresses associated with Idemitsu’s U.S. blending operations, align with ILA production.
• Industry disclosures and OEM supply relationships: Idemitsu has a long‑standing role supplying Honda with factory‑fill and service‑fill lubricants in North America.

Taken together, these indicators corroborate Idemitsu’s role as the contract blender behind Pro Honda motorcycle oils, even though the label and distribution remain under American Honda.

Key products typically produced by Idemitsu for Pro Honda

While formulations and suppliers can evolve, the following Pro Honda oils are widely cited as Idemitsu‑produced in North America:

• GN4 conventional motorcycle oils (e.g., 10W‑30, 10W‑40)
• HP4 semi‑synthetic motorcycle oils
• HP4S full‑synthetic motorcycle oils

These cover the core engine oil offerings at Honda motorcycle and powersports dealers, with viscosity grades and formulations aligned to Honda’s JASO MA/MA2 wet‑clutch requirements.

Why it matters

Knowing who blends a private‑label oil helps riders evaluate quality and consistency. Idemitsu is a Tier‑1 OEM supplier with deep base oil and additive expertise, which supports the performance claims Honda makes for shear stability, clutch compatibility, and deposit control in Pro Honda oils. That said, Honda owns the specifications, so the formula is built to Honda’s targets rather than being an off‑the‑shelf Idemitsu product.

Regional and product‑line nuances

Honda’s automotive “Honda Genuine” oils and fluids can come from multiple approved blenders depending on region and product (e.g., some North American automotive engine oils have also been supplied by Phillips 66 in certain periods). However, for Pro Honda motorcycle engine oils in North America, Idemitsu Lubricants America is the primary manufacturer of record. If in doubt, checking the current Safety Data Sheet for the exact product and viscosity will show the latest manufacturer/preparer details.

Bottom line

Pro Honda motorcycle engine oils are manufactured for American Honda by Idemitsu Lubricants America, with Honda providing the specifications and Idemitsu handling blending and packaging. Always verify the latest SDS or label for your specific product and region, as supply arrangements can change.

Summary

Idemitsu Lubricants America makes Pro Honda engine oils (GN4, HP4, HP4S) for Honda in North America, blending to Honda’s specs and packaging under the Pro Honda brand. While Honda may use other approved blenders for some automotive oils or in other regions, Idemitsu is the principal producer tied to Pro Honda motorcycle oils in this market.

Who makes the highest quality synthetic motor oil?

6 of the Best Synthetic Motor Oils

• Amsoil Signature Series Synthetic Motor Oil.
• Castrol EDGE Advanced Full Synthetic.
• Mobil 1 Extended Performance.
• Pennzoil Ultra Platinum Full Synthetic.
• Royal Purple High-Performance Synthetic Oil.
• Valvoline Advanced Full Synthetic.

Who makes Pro Honda oil?

So Honda is sourcing base oil from Idomitsu. And then adding their own proprietary additive package to formulate the finished Honda motor. Oil.

Which company made Honda engine oil?

Description: Idemitsu Lube India in association with Honda Motorcycle & Scooter India Pvt. Ltd.

Does Mobil 1 make Honda oil?

Choose Mobil 1™ motor oil for your Honda
We offer a full range of synthetic and synthetic blend motor oils to keep your engine in peak condition throughout its lifetime.