Castrol euro car 5w30 quart was api sp . jug was sl rated
Same as the ESP one that meets the engine test requirements but not the bench test.It has around 1000 ppm ZDDP, which is above the chemical limit for an ILSAC grade (xW20, xW30) oil, hence it's "only" API SL. These limits don't apply to non-ILSAC grades like xW40. So the same add package in a 5W40 can be SN or SP, but in a 5W30 must be SL regardless of the oils quality.
The oil is a full synthetic with ACEA A3/B4, plus the very rigorous OEM approvals of BMW LL-01 and MB 229.5 so it's a very high quality oil. I use it all the time.
It says "API SERVICE SP" inside the donut and "API SL" outside. Which I take to mean that it meets API SP in engine performance testing, but API SL in chemical limits (Phos content).
A3/B4 in one of the pics, sideways.Which oil is this? A3/B4, or C3 (K)?