not so good anymore luv it five stars hmmm sounds like a impossible or at least a hard task to hot five stars but have had great service from auto meter mobil 1 is the best oil for the money and its nice you can not black purchased 2 boxes and have yet to use them as not great but not bad either good for diy tint jobs im happy five stars zinc phosphorous helps lubricate older motors mobil 1 syn vtwin oil is an excellent choice price gouge for case and individuals nice and dark looks great its a awesome product no complains here this is by far the worst product i have ever boughten five stars