Depends on the engine, how the car is driven and oil. Some oils with high NOACK numbers may not lose as much in the real world. What base oils are being used and what kind of VIIs are being used?
I'm using Idemitsu's 0W-20 in a friend's Subaru. That particular engine(FB25) is known for oil consumption. With a off-the-shelf 0W-20 oil, the car would use a quart of oil around 3.5-4K. I couldn't find the NOACK number for PP 0W-20 which was the last fill before the Idemitsu. On the Idemitsu, the car barely used any oil, the dipstick was down to 5/8th-2/3rds of a quart when I drained it. The car is short-tripped a lot with a weekly 60-100 mile highway trip. I have Havoline ProDS 5W-30 in a Nissan with a high(12.4% IIRC) NOACK value but it still meets D1G2 specs. I plan on checking the oil on that soon.
I think it was here or in a trade paper that the Japanese and maybe the Europeans like using PMMA or polyacrylate-based VIIs that provide better viscokinetic properties than traditional polyolefin VIIs but at the risk of higher volatility or deposits. Wouldn't be surprised if it was the Japanese, as Honda introduced 0W-20 oil in the 1st gen Insight/Civic Hybrid and Idemitsu works with all the Japanese OEMs.
I'm using Idemitsu's 0W-20 in a friend's Subaru. That particular engine(FB25) is known for oil consumption. With a off-the-shelf 0W-20 oil, the car would use a quart of oil around 3.5-4K. I couldn't find the NOACK number for PP 0W-20 which was the last fill before the Idemitsu. On the Idemitsu, the car barely used any oil, the dipstick was down to 5/8th-2/3rds of a quart when I drained it. The car is short-tripped a lot with a weekly 60-100 mile highway trip. I have Havoline ProDS 5W-30 in a Nissan with a high(12.4% IIRC) NOACK value but it still meets D1G2 specs. I plan on checking the oil on that soon.
I think it was here or in a trade paper that the Japanese and maybe the Europeans like using PMMA or polyacrylate-based VIIs that provide better viscokinetic properties than traditional polyolefin VIIs but at the risk of higher volatility or deposits. Wouldn't be surprised if it was the Japanese, as Honda introduced 0W-20 oil in the 1st gen Insight/Civic Hybrid and Idemitsu works with all the Japanese OEMs.