When selecting an oil, I understand that the Manufacturers Approval is a primary consideration. I have 4 vehicles with 4 different approvals
But, I am wondering about the various specifications available at most manufacturers websites. I have made a few assumptions below.
In particular:
1. VI - larger number is better, right? Range is generally 160-190
2. Shear - Larger number better? Most are 3.x-4.x
3. NOACK - Smaller % is better?
Priority - How do you rank the following specs in importance between oils with correct approval:
TBN
VI
Shear
NOACK
Thanks.
Sorry if this is already out there. I searched with no luck.
But, I am wondering about the various specifications available at most manufacturers websites. I have made a few assumptions below.
In particular:
1. VI - larger number is better, right? Range is generally 160-190
2. Shear - Larger number better? Most are 3.x-4.x
3. NOACK - Smaller % is better?
Priority - How do you rank the following specs in importance between oils with correct approval:
TBN
VI
Shear
NOACK
Thanks.
Sorry if this is already out there. I searched with no luck.