Do you believe repentance is works?
My readings on Romans3-4 showed me
works /obeying levitical and mosaic law to gain righteousness was wrong and they fell short and to truly have righteousness it would be through Faith and then your works or theirs because they are Jewish would be easier or come naturally?
For me not being Jewish following the Law would be wired I think but I see that as I would naturally not want to sin because of Gods imputed righteousness and it would only get stronger through sanctification .
Could This be work based salvation?
Repentance is not works salvation. Basing your hope of salvation on the success of your repentance is works based salvation.
If you have the Holy Spirit within you - He will convict of sin and lead you in repentance. If you do not find yourself repenting of sins you commit, you have reason to wonder if the Holy Spirit is in you since this is one of the things that He does.
There is a world of difference between any believer following the Spirit's lead in repentance and them attempting to be justified by their repentance.
For us gentiles who never had the law of Moses given to us - we must rely on our conscience, the clear teaching of God's Word, and the conviction of the Spirit to tell us if we are breaking "the law of God".
The scripture is very clear that no one will be justified before God by keeping the law. That goes for the law written on tablets of stone or the law written in our hearts. That goes for people who have not received the pledge and sealing of the Holy Spirit that assures us that we have passed from death to life and will never again come into condemnation as well as for us who already have eternal life.
Our eternal salvation must never be viewed as coming from keeping the law.
"......by the works of the Law no flesh will be justified in His sight...." Romans 3:20
Keeping the works of the law is exactly what is happening when you accept Christ and then depend on you good works of repentance to justify you.
"You foolish Galatians, who has bewitched you, before whose eyes Jesus Christ was publicly portrayed as crucified? This is the only thing I want to find out from you: did you receive the Spirit by the works of the Law, or by hearing with faith? Are you so foolish? Having begun by the Spirit, are you now being perfected by the flesh? Did you suffer so many things in vainif indeed it was in vain? So then, does He who provides you with the Spirit and works miracles among you, do it by the works of the Law, or by hearing with faith?" Galatians 3:1-5
"For when Gentiles who do not have the Law do instinctively the things of the Law, these, not having the Law, are a law to themselves, in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them," Romans 2:14-15
We must have faith that Christ's work at Calvary is enough to keep what we have entrusted to Him against that day.
"For this reason I also suffer these things, but I am not ashamed; for I know whom I have believed and I am convinced that He is able to guard what I have entrusted to Him until that day." 2 Timothy 1:12
The Bible knows nothing about "temporary eternal life."
Truly, truly, I say to you, he who hears My word, and believes Him who sent Me, has eternal life, and does not come into judgment, but has passed out of death into life." John 5:24
All of this is not to say that our woks do not matter or that we will not face consequences for our actions (or our inactions concerning successful repentance for that matter).
"For we must all appear before the judgment seat of Christ, so that each one may be recompensed for his deeds in the body, according to what he has done, whether good or bad." 2 Corinthians 5:10
"each mans 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 mans work. If any mans work which he has built on it remains, he will receive a reward." 1 Corinthians 3:13-14