Looking for a high quality grease (preferably Schaeffers) to replace the last bit of Royal Purple grease I had in my grease gun. From what I understand, the RP stuff is aluminum based as is #274 from Schaeffers. Would that be ok to mix? What I'm going to be mainly greasing are my ball joints, tie rod ends, and U-Joints. I really cant remember what partnumber of royal purple grease I used. I live here in So. Cal so it never freezes. Is #274 a good alternative for my purpose and outside weather conditions?