API Service Category SN was first introduced in 2010 for use in gasoline engines. Oils meeting API SN are designed to provide improved performance across a wide range of areas including high temperature deposit protection for pistons and improved protection against the formation of engine sludge.
Oils that satisfy API Service Category SN are superior in performance to those meeting API SM and earlier and can effectively lubricate engines calling for those Service Categories.
API SN is typically seen claimed in conjunction with a wide range of different performance claims including ILSAC standards, ACEA Oil Sequences and many OEM performance specifications.
In some cases oils meeting API SN also carry a Resource Conserving claim to show that the oil has been formulated to improve fuel efficiency. These oils are typically low HTHS (≤ 3.5cP) SAE 5W-30, 5W-20, 0W-30 and 0W-20 based on API Group II, Group III or Group IV base oils and coupled with ILSAC GF-5.
For more information on API SN, contact your Lubrizol representative.