[en] The relative changes in the low-temperature susceptibility of a number of dilute mixtures of ³He in liquid ⁴He at various pressures are reported and analyzed. Under elevated pressures, the solubility of ³He in ⁴He increases and the effects of the interaction between ³He quasiparticles clearly become larger. However, no evidence of a BCS pairing transition was found in direct measurements of susceptibility and nuclear resonance frequency down to the temperature 1.5 mK in saturated solutions with a pressure of 21 bar