Why does this Naphthenic Oil having high Specific Gravity. Is it suitable to being used in transformer?

THE SG YOU SSTATED IN YOUR QUISTION IS ALMOST NEAR TO THE SG OF WATER THUS IT WILL ALMOST NEAR TO MIXED WITH WATER SOME TIME, AND WILL ALSO REDUCED THE INTERFACIAL TENSION OF YOUR OIL AND SOME TIME WHEN Y0U HAVE TO TAKE THE SAMPLE FOR TESTING YOU MIGHT BE EXPERINCEE SOME CRACKLE IN YOUR OIL THAT CAN EXPLAIN YOU THE CONDITION OF YOUR TRANSFORMER AND THE EFFECT THE WATER CAUSES ON YOUR SYSTEM THE SPECIFIC GRAVITY LIMITS OF THE TRANSFORMER OIL ARE AS 0.890MAX, TO POSIBBLY REDUCED ALL THESE THINGS.