If you do a search for 'specific heat' keyword, you'll find lots of information recently discussed. From one of the posts:
Hi BWodka: My wife gave me a present last weekend: a 4th Edition of Marks' Handbook for Mech. Engineers, printed in 1941. (Only an engineer could love something like this). This edition says: "The specific heat (c) of petroleum products at temperature (t) deg F is given by the equation
c = (0.388 + 0.00045t)/(sqrt specific gravity)"