70N / 80N / 100N / 120N / 150N / 165N / 200N / 220N /230i / 240N
250N / 300N / 330i / 330i / 340i / 350i / 500i / 600i / 610N / 700N
150BS (Bright Stock)
Group I base oils are classified as less than 90 percent saturates, greater than 0.03 percent sulfur and with a viscosity-index range of 80 to 120. The temperature range for these oils is from 32 to 150 degrees F. Group I base oils are solvent-refined, which is a simpler refining process. This is why they are the cheapest base oils on the market.