guys i as most of you work on the older motors and i am working on a 60’s era johnson 6hp, and have read serveral clips on lower unit lubes,,, i have been using hy vis by omc and finding it hard to come by ,,,,,a dealer told me hypro will work just fine,,, it syn. and not sure what to expect . and some have said merc 80w90 will be just great,,, so please express what your thoughts are and if had any experience with these and i’ll stand by ,,,,thank you and happy wrenching,,,