In order to accommodate the global undersupply of bright stocks, different substitutes are available. One of the options is that of using heavy naphthenic grades. The present paper illustrates a super heavy naphthenic oil produced from a heavy naphthenic distillate that can be used in the formulation of lubricants for applications where tackiness combined with high shear stability is required. Properties such as film strength, thickening effect, tackiness and shear stability have been tested on the super heavy naphthenic oil and on a series of polyisobuthene polymers with different molecular weight. The results of the study enlighten the complementary characteristics of these two types of products.
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