This is a very popular sunny hansa yellow with high chroma, but may have lightfastness issues (see note on the entry for Pigment PY74LF). Lightfastness ranges from decent to moderate in tints, and depending on the supplier, lightfastness may be insufficient. The transparent types tend to be a greener yellow and are not as weatherfast as the opaque versions of this pigment.
This is a pigment wherein their are stabilized types and transparent un-stabilized types, which also seem to vary in opacity as well as hue. This article briefly describes both types.
PY74 is a slower drier, so if the oil paint dries quickly it may have driers added. Artiscreation also mentions that the pigment has different forms, and that lightfastness may be better in the opaque versions.
Like several other hansas, this color may metabolize to a potential carcinogen and could cause methemoglobinemia, see Monona Rossol's writing for more.
