"Milton Waddams" wrote in message
...
What is the best oil for small diesel engines? I have heard that
paraffin based oils are more likely to sludge up and naptha based oil
is better. Then I have heard that paraffin based oils are so highly
refined that they are actually better than naptha based oil. How does
synthetic oil stack up to against the "natural" oil?

Milton

Stop worrying about the base. Just make sure the oil you use is approved to
API spec CD, CE or CF4, or to CCMC spec D4 or D5 and you will not have any
problems.