API has drafted and circulated for comment user language for the new API SN Plus ‘supplement.’ The user language defines the category and will become part of API 1509 — which describes the voluntary API Engine Oil Licensing and Certification System and explains to marketers how different API marks are licensed and displayed for the consumer. API SN | ILSAC GF-5 Engine Oils PSC offers Engine Oils that meet or exceed the requirements of ILSAC GF-5 & API Service SN with Resource Conserving. Where only API SM is claimed these oils are typically high HTHS (≥ 3.5cP) SAE 10W-40, 15W-40 and 20W-50 based on API Group I or Group II base oils. I have a new Craftsman lawn tractor (model 917.28856). Since 1924, the American Petroleum Institute has been a cornerstone in establishing and maintaining standards for the worldwide oil and natural gas industry. However, you have to pay attention to the year of construction of the engine. API continues to license engine oils against API SM and it is considered to be a current specification. When purchasing oil, the oil has a quality level (API Service). API SP with Resource Conserving matches ILSAC GF-6A by combining API SP performance with improved fuel economy, emission control system protection and protection of engines operating on ethanol-containing fuels up to E85. If you have a vehicle which was built after 1994, you should check in the categories from CD to CJ-4. short answer is no, API classifications are backwards compatible I think you might find it hard to find an SF,SG,SH or even an SJ rated oil SL was a classification released in 2001 so if they recommend SF,SG,SH,SJ, and SL then SM or SN or the next one which I believe is SN Plus should be ok var sm = new sn_ws.RESTMessageV2("
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