and that under the belief that Hansberger, if he “ever had any right to use said trust deed dated November 1, 1945, was still the owner thereof, plaintiff tendered to said Hansberger the full amount due under said note and trust deed in December, 1949,” which tender and demand were refused.
The fourth and fifth counts merely restate the allegations of the second and third counts and differ only in the relief demanded, namely, damages, rather than the setting aside of the trustee’s sale.
Plaintiff cannot predicate a right to any relief upon the alleged oral agreement entered into concurrently with the execution of the promissory note and trust deed dated November 1, 1945, covering the transaction in question. The proof of the asserted oral agreement must of necessity rest in parol. Such evidence, however, is not admissible to establish an agreement at variance with a contract in writing. (Civ. Code, § *1625; Code Civ. Proc., § *1856; Scatena v. Lawson, 95 Cal.App. 720, 724-725 [273 P. 592]; McArthur v. Johnson, 216 Cal. 580, 582 [15 P.2d 151]; Lindemann v. Coryell, 59 Cal.App. 788, 791 [212 P. 47].) This is not a rule of evidence merely but one of substantive law. (Harding v. Robinson, 175 Cal. 534, 540 [166 P. 808]; McArthur v. Johnson, supra.)
■ Plaintiff contends, however, that none of the defendants, except Title Insurance and Trust Company, can invoke the parol evidence rule, asserting that they are not parties named in the trust deed and not successors to parties named therein. (See Code Civ. Proc., § 1856.) Plaintiff is in error for the other defendants acquired their interests by reason of the trustee’s sale and their deeds from the trustee. Hence they are clearly successors in interest to the trustee and entitled to invoke the parol evidence rule.
Likewise, plaintiff is not entitled to any relief by reason of the alleged subsequent oral agreement in January, 1946, wherein it was assertedly agreed between him and Hansberger that the time for paying the promissory note of November 1, 1945, would be extended until the litigation then pending between him and defendants Russell and Vaughan was terminated. This was an effort to alter the terms of a contract in writing, which can only be done “by a contract in writing, or by an executed oral agreement, and not otherwise.” (Civ. Code, § 1698.) The alleged oral agreement was obviously not executed. Therefore, as pointed out in Staf