G.R. No. L-29981 April 30, 1971
EUSEBIO S. MILLAR, petitioner, vs. THE HON. COURT OF APPEALS and ANTONIO P. GABRIEL, respondents.

FACTS

Petitioner Eusebio S. Millar obtained a favorable judgment against respondent Antonio P. Gabriel for a sum of money. After the Court of Appeals dismissed Gabriel’s appeal, Millar moved for execution. The sheriff seized Gabriel’s jeep, but the parties subsequently entered into a chattel mortgage agreement over the vehicle. The mortgage deed explicitly stated it was given as security for the payment of the judgment debt in the specific civil case, setting a reduced principal sum of P1,700 payable in two installments. Gabriel defaulted on the first installment, prompting Millar to seek and obtain several alias writs of execution over the years to enforce the original judgment.
In 1961, after a fifth alias writ was issued, Gabriel filed a motion to suspend the execution sale, alleging payment. The lower court, after a hearing, ordered execution to proceed, ruling that the chattel mortgage was merely for security and did not novate the judgment. The Court of Appeals reversed this order, holding that the subsequent agreement impliedly novated the original judgment obligation. The appellate court cited four circumstances of incompatibility: the reduced principal amount, the stipulation of installment payments, the inclusion of liquidated damages for default, and the creation of a security interest via the mortgage.

ISSUE

Whether the chattel mortgage agreement impliedly novated the original judgment obligation, thereby extinguishing it and precluding further execution on the judgment.

RULING

The Supreme Court reversed the Court of Appeals and reinstated the lower court’s order for execution. The Court held that no novation, express or implied, took place. The legal logic centers on the test of incompatibility between the old and new obligations. Novation by implication requires clear and convincing proof that the two obligations cannot stand together. The Court found no such substantial incompatibility here. The chattel mortgage was expressly constituted as “security for the payment… of the judgment.” This unequivocal language indicated the parties’ intent to reinforce, not replace, the judgment debt. The changes cited by the Court of Appeals—such as the reduced sum (explained by partial payments made before the mortgage), the installment terms, and the added stipulations—were merely accessory or modificatory conditions that did not alter the essential object and cause of the obligation: the payment of the judgment award. Since the original judgment debt and the secured obligation under the mortgage could coexist, with the latter serving as a collateral undertaking, novation did not occur. Consequently, the petitioner retained the right to enforce the original judgment via a writ of execution upon the respondent’s default under the mortgage agreement.