[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