  A very long term variability (VLPP), with period of 875 days, was observed in
the long-term light curve of FS Aurigae in 2011. This periodicity was
calculated on 6 cycles. We re-examine the periodicity with new observations
over of the past 5 yrs. A total of 18 yrs of observations confirm the
hypothesis of a third body perturbing in a secular way the cataclysmic variable
(CV). Improvements to the model such as eccentric and inclined orbits for the
third body and a binary post-Newtonian correction are considered. We confirm
the VLPP of FS Aur and find the new period of 857 $\pm$ 78 days. The secular
perturbations are most efficient when the mass of the third body is M=29 MJ,
much less than the 50 MJ reported in 2011. We estimate the effect of the third
body on the mass transfer rate and the brightness of the system. We consider
alternative scenarios for the VLPP. The new data and analysis supports the
hypothesis that FS Aur is a CV in a triple system.
