If you can lose salvation it AINT ETERNAL.
The Greek term often translated as "eternal life" is "zOE aiOnios" . aiOnios is an adjective formed from the noun aiOn, which means an age or an eon, and refers to a period of time whose end is indeterminate. AiOn does not mean an endless period. And the adjective derived from aiOn does not mean endless. It means age-long, or as I often translate it with a word I coined, "aeonous".
Since aeonous life is not an endless life according to its etymology, a salvation that can end can indeed still be aeonous. That may not be eternal, but then again, aiOnios does not mean eternal anyway.