The oil you are looking for is called "TC-W3", and is originally intended for watercraft. It is highly refined, assless and tests verify that it adds lubricity to both diesel and gasoline. There are plenty of websites that discuss the TC-W3 in diesel, and what TC-W3 to diesel fuel ratio is recommended.
I DO NOT WANT TO START A UNICORN thread, but some also attest to adding one ounce of TC-W3 per five gallons of gasoline (a ratio of 1 to 640). There are many reasons why this is recommended and many of the potential concerns (plugged cats, etc.) do not appear to apply. I have tried it (A-B-A-B) and have my own results; however, I don't want to be bashed or have my testing practices questioned -- since that normally results (on various websites) whenever these types of fuel additives are discussed.
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