CroR1 said:
One compared to the other, I see those are both synthetic.
I was a member for about a year and think its the only oil that surpasses the competition due to the longer extended drain intervals which ultimately saves you money at the end by not having to change your oil so often,so basically it all comes down to extended drain intervals being the signature series having overall the highest level of protection at 25k or 15k under severe service,the other two are just as good but have shorter draining intervals and shorter mileage protection,due apologize for interfering. Z