EXHIBIT 99.3 FIRST AMENDMENT TO CREDIT AGREEMENT THIS FIRST AMENDMENT TO CREDIT AGREEMENT (this "Amendment") dated as of June 1, 1998 is among: HOWELL PETROLEUM CORPORATION, a Delaware corporation (the "Borrower"); each of the Lenders (as defined in...Credit Agreement • June 12th, 1998 • Howell Corp /De/ • Wholesale-petroleum & petroleum products (no bulk stations) • Texas
