In this episode of SOIC, we discuss a powerful investing mental model called product mix change. We analyze two precision engineering companies — SANSERA Engineering and Shriram Pistons & Rings — to understand how legacy auto businesses are using their cash flows to build future-ready segments.

Sansera is moving beyond ICE auto components into aerospace, defence, semiconductors, and EV-agnostic parts, while Shriram Pistons is using its pistons business as a cash cow to expand into automotive interiors and ambient lighting through acquisitions.

This episode is not about buy or sell recommendations. It is initial research focused on understanding how businesses transition over time and how investors can track long-term value creation using the product mix change framework.