It is one of the best brands/quality oils available in the market.
I have been using it since 2012. Both time in XLis which were purchased brand new. My first xli, which was sold in 2014 was driven up to 165,000 kms with oil change intervals of 10,000 kms. So I totally changed oil 16 times. My second xli 2015 model has been driven now arond 150,000 kms. I am using Mobil 1 0W-40 from first oil change i.e., 5,000 kms with 10,000 kms oil change intervals. I use only OEM oil filter and change that too at 10,000 kms along with the oil.
My cars engine is just like new. I change air filter at 20,000 kms with cleaning at 5,000 kms. This is because I live in a rural area of south Punjab where there is too much dust.