In later years GM often removed the 10w30 recommendation for temperatures above freezing, and said to use 5w30 year round. During those years, they had the same engine architectures.
So this is another vote for 5w30.
In addition, HM oils like MaxLife tend to be made tougher than than their basic counterparts, which may further reduce shear.
So this is another vote for 5w30.
In addition, HM oils like MaxLife tend to be made tougher than than their basic counterparts, which may further reduce shear.
