I want to make sure I understand API/ILSAC/ACEA classifications correctly, hopefully I can get a quick yes/no on the following questions:
1) API ratings are in alphabetical order and each letter supersedes the one before it, correct? If an engine requires an oil that meets API SL, then an oil that's SM or SN is ok?
2) ILSAC GF-# is in linear numeric order, correct? If an engine requires ILSAC GF-3, then GF-4 or GF-5 are ok?
3) ACEA is segregated into different categories based on type and they do NOT supersede each other, correct? If an engine requires ACEA A1/B1, then the only other one that's compatible is A5/B5?
4) ACEA and API are mutually exclusive... maybe? From what I understand, because ACEA also has to meet certain standards for diesel, the extra detergents run foul of the API tests so an oil that meets an ACEA spec can't also meet any API spec too, correct?
Thanks in advance.
1) API ratings are in alphabetical order and each letter supersedes the one before it, correct? If an engine requires an oil that meets API SL, then an oil that's SM or SN is ok?
2) ILSAC GF-# is in linear numeric order, correct? If an engine requires ILSAC GF-3, then GF-4 or GF-5 are ok?
3) ACEA is segregated into different categories based on type and they do NOT supersede each other, correct? If an engine requires ACEA A1/B1, then the only other one that's compatible is A5/B5?
4) ACEA and API are mutually exclusive... maybe? From what I understand, because ACEA also has to meet certain standards for diesel, the extra detergents run foul of the API tests so an oil that meets an ACEA spec can't also meet any API spec too, correct?
Thanks in advance.