Since Blackstone cut off the last bit of the oil description, this was QSUD 5w30 that was tested. I was quite impressed actually, even though my oil smelled like it had some gas in it, it still maintained TBN nicely. I had to use 1/2 qt. of PP (non-Pure Plus) 5w20 and 1/4 qt. of QSUD 5w30 for...