Measurements of dynamic viscoelastic properties in very small oscillating shear deformations have been made on solutions of a jet fuel, Jet A, containing an antimisting polymeric additive, FM‐9. A few measurements were also made on solutions of FM‐9 in a mixed solvent of mineral oil, tetralin, ando‐terphenyl. Two samples of FM‐9 had approximate number‐average molecular weights of 12,000,000 and 8,100,000 as deduced from analysis of the measurements. The ranges of variables were 2.42–4.03 g/L in concentration (0.3 to 0.5% by weight), 1–35°C, in temperature, 1.3–9.4 cp in solvent viscosity, and 103–6100 Hz in frequency. Measurements in the Jet A solvent were made both with and without a modifying carrier. The results were compared with the Zimm theory, and the viscoelastic behavior was found to resemble rather closely that of ordinary nonpolar polymers in Θ solvents. The relation of the results to the antithixotropic behavior of such solutions at high shear rates is discussed in terms of intramolecular and intermolecular interactions.