Sadly not sure I asked twice and he said SPI CA and said it’s regular oil conventional
doesn’t know if it’s semi or syn
Never heard of SPI and the only CA I know is the original diesel
API spec ”CA” but that is from about the 1940’s with CB in the 50’s and CC class oil from the 60’s (or thereabouts). These are a completely obsolete oil classes. We are up to API CK now with CH being the oldest I have seen on the shelves.
With API (
American Petroleum Institute) you had Cx for diesel Compression ignition engines, and Sx for gasoline Spark ignition engines. Plus there are some new FA diesel oils that are less viscous and more Fuel efficient. Maybe he said “
FA” as these are usually 5W30’s or 10W30’s.
Conventional means a mineral (non-synthetic) oil, but sometimes they are a synblend (semi-synthetic) to meet the modern API specs.
You also have the Euro ACEA specs, but these are unlikely as a bulk fill in America.