Another way to look at your query is by viewing discard/condemning limits for Engine oils.
1. Viscosity : (+) 25% or (-) 20% from original KV 100 deg C (+) 45% or (-) 25% from original KV 40 deg C 2. Base No (TBN) : (+) or (-) 50% change from original TBN 3. Water/Moisture: (+) 0.3% by volume 4. Insoluble : (+) 2% by weight 5. Flash Point : Min 170 Deg C - PMCC : Min 190 Deg C - COC