Originally Posted By: jake88
Originally Posted By: Garak
800 ppm max is the limit when discussing an oil that is SM/GF-4 or SN/GF-5. There are different rules with resource conserving ILSAC rated oils. Also, oils that are thicker than resource conserving grades have higher limits. 10w-40, 15w-40, 20w-50, and straight grades have different rules.
Good explanation. Also look here for a complete look at the differences between ILSAC GF5, API SN, and API SN with resource conserving designation.
http://www.infineum.com/SiteCollectionDocuments/notebooks/gf5/DifferencesGF-5_SN_SN-RC.pdf
Yes, the API/EPA/etc. do NOT expect anyone (
some of the VR1 bottles actually say "NOT STREET LEGAL!" right on them
) to put these old school, heavyweight oils into their new, sensitive O2 sensor and catcon-equipped vehicles.
Hence, the ability to give them the modern ratings
despite their MUCH more stout, supposedly catcon obliterating, add packs.