Have you ever smelled the HM oil? They have seal swell to mostly differentiate it from normal engine oils. But it smell like Brake Fluid DOT 4! So I ask:
Is the seal swell the same additive that goes in brake fluids DOT4 ? What is it? Can one mix them? I don't think so.
Is the seal swell the same additive that goes in brake fluids DOT4 ? What is it? Can one mix them? I don't think so.