Now tha I've answered and addressed the op's inquiry, I'll comment on Dispensationalism's teaching on the matter.
There are two camps within Dispensationalism. Classic Dispensationalists that continue to adhere to classic Reformed doctrines tend to be monergistic, whereas more modern Dispensationalists often subscribe to synergism. Both groups will agree that salvation is by grace through faith but the former will say both grace and faith come from God according to His will and purpose in salvation and, therefore, regeneration precedes faith. The synergists disagree, asserting faith is a function of the sinner's inherent faculty to respond provided when God made humans back in Eden. That is a matter of debate that has nothing to do with Dispensationalism.
The problem that is Dispensationalism-related is the fact Dispensational Premillennialism (and its modern futurist kin)
also teach a co-occurring salvation by works perspective. Dispensational Premillennialists (DPists) don't call it that or acknowledge its existence but that is what DPism teaches. DPism separates the rapture from the second coming and teaches there are two groups of God's people (Israel/Jews and the Church) with two completely different purposes. Israel/Jews will come to salvific faith in Christ as a function of the millennial reign. Either beforehand or during that time a series of events will occur: the Jews will build another temple, they will recapture all the land God originally promised Israel, they will reconstitute the Levitical priesthood and reinstitute animal sacrifices. All of these things are works. All of these accomplishments are taught in DPism as events that will occur in the process of Israel/Jews coming to salvation in Christ. A Jew may come to salvation at any time and become a Christian by professing their faith in Jesus as their Lord and Savior BUT those who are left behind after all the Christians are raptured off the planet will have to go through the temple/land/ritual/sacrificial stuff I just mentioned.
That is salvation by grace plus works.
Dispensational Premillennialism teaches to soteriologies, not one. Depending on what kind of Dispensationalist you are (monergist or synergist) it is possible for you to believe you cannot or can lose your salvation and be true to your theology. However, what the Bible teaches is salvation is by grace through faith for works, not by works.
1 Corinthians 3:10-16
According to the grace of God which was given to me, like a wise master builder I laid a foundation, and another is building on it. But each man must be careful how he builds on it. For no man can lay a foundation other than the one which is laid, which is Jesus Christ. Now if any man builds on the foundation with gold, silver, precious stones, wood, hay, straw, each man's work will become evident; for the day will show it because it is to be revealed with fire, and the fire itself will test the quality of each man's work. If any man's work which he has built on it remains, he will receive a reward. If any man's work is burned up, he will suffer loss; but he himself will be saved, yet so as through fire. Do you not know that you are a temple of God and that the Spirit of God dwells in you?
If a person is not building on the foundation of Christ, then s/he is lost and nothing can or ever will save him/her. In contrast, if a person is building on Jesus, then it is possible for all his/her work to be burned up by God's testing. S/he will lose everything, all their works gone, emerging from God's testing charred and covered in soot but still saved.