A: Possibly, if they have a cross collateral clause in your loan agreement with them on the separate loan. Most banks have cross collateral clauses in loan agreements that make it so all the collateral (the vehicle) securing one loan secures any other loans. If your loan has a cross collateral clause you would need to pay off both loans to get a lien release.
A: Under Oklahoma exemptions in a joint case where both spouses file bankruptcy each are able to exempt one car at a value of $7500 per vehicle. If there is a loan against a vehicle the equity should not exceed $7500 to be a protected asset.