Well, I found out for sure who makes the Honda 0W-20 oil, but they would not give me any real information. They did send me a MSDS but the way it's worded it does not tell much. Here is the email I received from them today.
Dear Mr. P,
Thank you for your interest and inquiry into Genuine Honda 0W-20 Engine Oil.
This product represents the culmination of Honda and Idemitsu’s extensive research and development performed in Japan. This oil was designed and tested to provide superior performance, and has been specially formulated for use in Honda passenger vehicles.
Regarding your question about the specifications, we are not at liberty to divulge this information without the approval of Honda Motor Corporation. The Engineering and Development teams at both companies have spent an enormous amount of time and resources in the testing and evaluation of the product and have chosen to keep this information confidential.
I can assure you that this product has passed all of Honda’s stringent tests and has been fully approved by Honda engineers.
Please do not hesitate to send me any comments or other questions that you may have.
Please see the attached MSDS sheet you requested.
Sincerely,
Damian Seipel
Sales & Marketing Manager
Idemitsu Lubricants America Corp.
Los Angeles Sales Office
2041 Rosecrans Ave Suite 355
El Segundo, CA 90245-4707
Dear Mr. P,
Thank you for your interest and inquiry into Genuine Honda 0W-20 Engine Oil.
This product represents the culmination of Honda and Idemitsu’s extensive research and development performed in Japan. This oil was designed and tested to provide superior performance, and has been specially formulated for use in Honda passenger vehicles.
Regarding your question about the specifications, we are not at liberty to divulge this information without the approval of Honda Motor Corporation. The Engineering and Development teams at both companies have spent an enormous amount of time and resources in the testing and evaluation of the product and have chosen to keep this information confidential.
I can assure you that this product has passed all of Honda’s stringent tests and has been fully approved by Honda engineers.
Please do not hesitate to send me any comments or other questions that you may have.
Please see the attached MSDS sheet you requested.
Sincerely,
Damian Seipel
Sales & Marketing Manager
Idemitsu Lubricants America Corp.
Los Angeles Sales Office
2041 Rosecrans Ave Suite 355
El Segundo, CA 90245-4707