Would anyone happen to know where I can find a graph showing Specific Heat as a function of temperature and viscosity for lubricating oil?
thanks
b

Why do you need the information, what do you want to achieve with it for which application?

Bryan,
There is/was a book by Exxon called Tables of Useful Information that had some details regarding this type of information. However that was more geared towards oil as a fuel and used the density and viscosity as a determiner. The problem with this is when you start looking at lubricants that get their specific gravity and their viscosity in part from their additave packages this then would have a significent impact in trying to determine the anticipated output from a product. The other issue is that the calculations are also based on total product usage at optimal conditions. So there is going to be some losses even when there is some viscosity blending going on. You would probably be better of taking this question to a conbustion engineering group. Here's one to look at.
http://www.eng-tips.com/gthreadminder.cfm/lev2/26/lev3/74/pid/610

regards.......

You've asked a very general question that does not have an easy straight forward answer as Alan has stated.

If you could be a little bit more specific with your problem, I might be able to give some answers.

What you have asked would be specific to the type of lubricant adn specific to the viscosity grade.

In general, with hydrocarbon based oils, specific heat will increase with an increase in temperature and slightly decrease with a more viscous version of the same oil type.