UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.      )

Filed by the Registrant x Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x  Definitive Additional Materials

¨ Soliciting Material Pursuant to §240.14a-12

The Wiser Oil Company

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

x  No fee required.

¨ Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1)  Title of each class of securities to which transaction applies:

(2)  Aggregate number of securities to which transaction applies:

(3)  Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

(4)  Proposed maximum aggregate value of transaction:

(5)  Total fee paid:

¨ Fee paid previously with preliminary materials.

¨ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

(1)  Amount Previously Paid:

(2)  Form, Schedule or Registration Statement No.:

(3)  Filing Party:

(4)  Date Filed:

THE WISER OIL COMPANY

POSTPONES ANNUAL MEETING OF STOCKHOLDERS

Contact:

Peggy S. Loyd

Investor Relations

Phone: (214) 265-0080

Email: prloyd@wiseroil.com

DALLAS, May 28, 2004 – The Wiser Oil Company (NYSE: WZR) announced today that in light of its agreement to be acquired by a wholly-owned subsidiary of Forest Oil Corporation (NYSE: FST) for $10.60 per share in cash pursuant to a tender offer followed by a merger, it has decided to postpone indefinitely its 2004 Annual Meeting of Shareholders previously scheduled for June 8, 2004. In the event the agreed upon merger with a subsidiary of Forest Oil Corporation is not consummated, the meeting will be rescheduled.

The Wiser Oil Company is a Dallas, Texas based independent energy company engaged in the acquisition, development and production of oil and natural gas in the United States and Canada.

This press release is neither an offer to purchase nor a solicitation of an offer to sell securities of The Wiser Oil Company. The tender offer is being made solely by an Offer to Purchase and related Letter of Transmittal that have been disseminated to the stockholders. The Wiser Oil Company stockholders are advised to read the Offer to Purchase on Schedule TO and the Solicitation/Recommendation of the Board of Directors of The Wiser Oil Company on Schedule 14D-9, each of which were filed with the Securities and Exchange Commission on May 28, 2004 because they will contain important information. The Offer to Purchase, the Solicitation/Recommendation Statement and any other relevant documents filed with the Securities and Exchange Commission are being made available to stockholders of The Wiser Oil Company at no expense to them. These documents are also available without charge at the Securities and Exchange Commission’s website at www.sec.gov.

-END-