Frequently Asked Questions

Yes, both Idemitsu and Idemitsu ZEPRO engine oils are full synthetic products.
Yes, you can switch from conventional and synthetic blend engine oils to Idemitsu full synthetic.
Idemitsu formulates products based on our customers’ needs. Our focus is on lower viscosity engine oils because we provide factory fill products to many of the Asian vehicle manufacturers who utilize the low viscosity lubricants for performance and protection requirements.
We recommend following your manufacturer’s owner’s manual for viscosity and oil change intervals.
Please use our convenient Product Finder that is linked here. If you have a more specific question about Idemitsu products for your vehicle, please email us at
At Idemitsu, we believe that “one multi-vehicle transmission fluid does not fit all.” We are proud to offer exclusively formulated automatic transmissions fluids (ATF) and continuously variable transmission fluids (CVTF) that are specific to Asian vehicle transmission applications. You can find out more about our transmission products here.
Please send us an email to with the year, make and model of your vehicle and the product that is recommended in your owner’s manual. One of our Idemitsu technical experts will reply directly to you. (All inquiries are answered within 48 hours of receipt. Office hours are EST.)
You can find the TDS and SDS for each product by clicking on the Idemitsu or ZEPRO tabs at the top of the home page, select the product and scroll down to the bottom to Specifications & Approval, where you will find downloadable PDF documents.
Please visit for information about our rotary products.
Our manufacturing and packaging facility is located in Jeffersonville, Indiana. We also have a research and development laboratory in Wixom, Michigan.
We do not sell our products to consumers directly. Our products are distributed via warehouse distributor partners with select products available at retailers such as Advance Auto Parts, NAPA Auto Parts Stores and Amazon.