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Auto loans: credit unions vs. installment lenders

Check membership first. Then compare the APR, total repayment and conditions behind each loan offer.

4 reviewsCompare eligibility & rates

Start with your state and county. Three lenders here are regional credit unions. Mariner Finance offers personal installment loans that can fund a car purchase. The reviews below explain the difference and the terms to compare.

America First Credit Union logo
America First Credit Union

America First Credit Union

4.5 / 5 · Editorial rating

For eligible members in the Mountain West. Compare fixed auto rates, terms from five to eight years, and pre-approval before visiting a dealership.

Key features

Fixed APRs by term

The rate table lists 5, 6, 7 and 8 year fixed rates.

Pre-approval for new cars

AFCU invites you to get pre-approved before you visit a dealership.

Used and refinance loans

The same page covers used auto loans and auto refinance.

Declining Rate Auto loan

The interest rate falls with each on-time payment.

Pros

  • Rates are published by term, with an "as of" date: Tuesday, October 20, 2026.
  • Terms run from 5 to 8 years, and used loans are described as priced as low as new car loans.
  • The page says you can get pre-approved before you visit a dealership.
  • The maximum APR for consumer loans is stated as 18%.

Cons

  • Membership is limited by county, employer or family tie, so many buyers cannot join.
  • The rates shown are for Utah, and other states are on separate pages.
  • The 8-year term requires a loan of at least $30,000 and carries the highest APR in the table.
  • The page does not publish separate used or refinance rates in the table.
Desert Financial Credit Union logo
Desert Financial Credit Union

Desert Financial Credit Union

4.4 / 5 · Editorial rating

For eligible Arizona members. Desert Financial lists one headline APR for new, used and refinance auto loans, plus a delayed first-payment option on qualified loans.

Key features

One rate for three loan types

New, used and refinance loans share the same headline APR.

Up to 90 days to first payment

Qualified purchase and refinance loans can delay the first payment.

No application fee on purchases

The page says there are no application fees when you buy a new or used vehicle.

Refinance with e-signature

You can sign at a branch or through DocuSign.

Pros

  • A single published APR of 6.34% for new, used and refinance loans, easy to read.
  • No application fees on new or used purchase loans, according to the page.
  • Up to 90 days to first payment on qualified loans.
  • Membership covers all of Arizona, plus immediate family of members.

Cons

  • The rate assumes excellent credit and has no rate-by-term table.
  • The 90-day offer caps the term at 75 months, a shorter maximum than some peers.
  • The page does not mention pre-approval.
  • Membership is tied to Arizona and requires keeping $25 in a membership savings account.
SDCCU logo
San Diego County Credit Union

SDCCU

4.3 / 5 · Editorial rating

For eligible Southern California members. Compare rates by vehicle age and term, including loans up to 84 months and the interest cost of a payment deferral.

Key features

Rates by term and model year

The rate page lists new and used APRs for terms of 48, 66, 78 and 84 months.

Up to 100% financing

The auto loan page lists up to 100% financing.

90 days with no payments

Qualified buyers can get 90 days with no payments.

Apply online, in a branch or by phone

The page lists several ways to apply.

Pros

  • Rates published by term and model year, with an effective date of November 2, 2026.
  • New autos start at 4.89% APR as low as, the lowest new-car rate in this group.
  • Terms up to 84 months and up to 100% financing.
  • 90 days with no payments for qualified buyers.

Cons

  • The rate page does not list refinance rates.
  • Terms over 66 months need a $15,000 minimum loan, and terms over 78 months need $25,000.
  • The 84-month rates are about 1.3 points higher than the shortest terms.
  • Interest accrues during the no-payment period.
Mariner Finance logo
Mariner Finance

Mariner Finance

3.8 / 5 · Editorial rating

A personal installment lender, not a credit union. Mariner markets loans for car purchases, with fixed payments and a soft inquiry to check available offers.

Key features

Soft-inquiry offers

Checking offers does not affect your credit score.

Fixed-rate installment loans

Payments and rates are fixed over a scheduled period.

Optional vehicle collateral

A vehicle lien may be needed for the lowest rates or larger amounts.

15-day satisfaction guarantee

Finance charges are waived if you repay in full within 15 days.

Pros

  • Checking offers uses a soft credit inquiry.
  • Loans start at $1,000, which suits small used-car purchases.
  • Fixed rates and fixed payments over 12 to 72 months.
  • A 15-day window to repay and have finance charges waived.

Cons

  • APRs of 15.99% to 35.99% are much higher than the credit union rates here.
  • Loans may include origination fees, and Mariner's site does not publish the amount.
  • It is a personal loan, not a dedicated vehicle loan, and amounts stop at $25,000.
  • Online loans are limited to $1,500 to $14,000.

First, check where you can apply

Who can join or borrow?

Confirm the exact eligibility rules before requesting a loan quote. On a phone, scroll across the tables to see all columns.

Eligibility · recorded Nov 2, 2026
LenderMembership or locationProduct
America FirstListed counties or eligible family/employer ties; auto financing in UT, NV, AZ, ID and NMNew and used auto loans; refinance
Desert FinancialArizona coverage area or eligible family connection; membership savings requiredNew and used auto loans; refinance
SDCCUNine Southern California counties, family or another listed membership routeNew and used auto loans
Mariner FinanceState availability and individual approval; no credit union membershipPersonal installment loan for a car purchase

Compare the rate and repayment term

Published rates · recorded Nov 2, 2026
LenderPublished APRTerms and conditions
America FirstFrom 5.24% for five years in UtahFive to eight years; eight-year minimum $30,000
Desert FinancialFrom 6.34%Quote required by term; 75-month cap on the described deferral offer
SDCCUNew from 4.89%; used from 5.19%Up to 84 months; model-year and amount conditions apply
Mariner Finance15.99% to 35.99%12 to 72 months; personal loan fees may apply

Which lender belongs on your shortlist?

Where can you qualify?

You qualify for America First membership

Check your state’s rate table

Compare purchase and refinance options before choosing a term.

You live or work in Arizona

Consider Desert Financial

Check membership and request the rate for your amount and term.

You qualify for SDCCU membership

Match the car to the rate table

Vehicle age, loan size and term all affect the comparison.

You are considering Mariner Finance

Compare the personal loan carefully

Check APR, fees, net proceeds and any vehicle lien against other available offers.

Put the full cost next to the payment

Same loan amount

Start with the amount financed

Include only the borrowing you need. Ask how fees or optional products change that amount.

Same term

Compare total repayment

A longer term can lower the monthly payment while adding interest.

Payment deferrals

Check when interest starts

No payment due does not necessarily mean no interest accrues.

Before accepting an offer

How we compare

  1. Eligibility

    Check state, county and membership rules.

  2. Product

    Separate auto loans from personal installment loans.

  3. Cost

    Compare APR, fees and total repayment.

  4. Conditions

    Read collateral and payment-deferral terms.

We compare published lender terms and membership rules. We did not borrow from these lenders or test their approval process. Ratings are editorial estimates, not customer scores. Published rates are starting points, not personalized quotes.

Sources and rate dates

The source content records these terms on November 2, 2026. Confirm current rates and eligibility directly with each lender.

Frequently asked questions

  1. Does joining a credit union guarantee a loan?

    No. Membership and loan approval are separate. The lender still checks your application and determines the terms it can offer.

  2. Is Mariner Finance a conventional auto loan?

    Its car-purchase pages describe personal installment loans. The loan may require vehicle collateral, but it is separate from the car purchase.

  3. Should I choose the lowest monthly payment?

    Compare the APR, term and total repayment as well. A lower payment over a longer term can cost more overall.

  4. Does a delayed first payment mean free borrowing?

    No. Interest may accrue before the first payment. Ask for the cost of the deferral in writing.