TomSeller
Super Member
The surprising find was my BX2200 (2003) calls for CD or CC. API list those as obsolete and not suitable for engines manufactured after 1990 or 1994.
Oils are generally backwards compatible.
First letter is for Compression (as in diesel), higher second letters are backwards compatible with lower second letters.
S on the first letter is for Spark (as in gas engine), same deal on the second letter as above