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A3/B3, A3/B4, A5/B5, C1, C2, C3, C4 are all long life approvals.

A1/B1, A5/B5, C1, C2 are low (thin) HTHS oils

A3/B3, A3/B4, C3, C4 are all high (thick) HTHS oils

BMW LL-98, LL-01 include high ... Login to read more.