Castrol is a mineral oil. Torco is a petroleum base with modifiers to simulate mineral.
Honda's old "HondaLine" oil was a mineral-based type, with ABSOLUTELY no detergent. (Made the cases get real dirty inside!)
Mineral oils are "low detergent" oils.
Valvoline's "racing" oils (non-synthetics) are low detergent, but not mineral-based oils.