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Sent a sample in of conventional VR1 10W30 any google searching brought up old data or for the 20w50 flavor. I was thinking of using it in my flat tappet cam motor but didn't believe Valvoline data sheet that showed lower than average zddp compared to other oils in the category. This VOA is...

What's your opinion when to change the oil for a one year oci? Before winter to have a lot of tbn for the harsher winter conditions in michigan, or just after winter to stretch the tbn out with less harsh summer conditions?