Wis. Stat. § 135.04
Except as provided in this section, a grantor shall provide a dealer at least 90 days' prior written notice of termination, cancellation, nonrenewal or substantial change in competitive circumstances. The notice shall state all the reasons for termination, cancellation, nonrenewal or substantial change in competitive circumstances and shall provide that the dealer has 60 days in which to rectify any claimed deficiency. If the deficiency is rectified within 60 days the notice shall be void. The notice provisions of this section shall not apply if the reason for termination, cancellation or nonrenewal is insolvency, the occurrence of an assignment for the benefit of creditors or bankruptcy. If the reason for termination, cancellation, nonrenewal or substantial change in competitive circumstances is nonpayment of sums due under the dealership, the dealer shall be entitled to written notice of such default, and shall have 10 days in which to remedy such default from the date of delivery or posting of such notice.
Wis. Stat. § 135.04
A grantor must give a 90-day notice when termination is for nonpayment of sums due. White Hen Pantry v. Buttke, 100 Wis. 2d 169, 301 N.W.2d 216 (1981). The notice requirement of this section applies to substantial changes of circumstances of a dealership, not a dealership agreement. Actions that substantially change competitive circumstances and that are controlled by the grantor or are allowed by the dealership agreement require the statutory notice. Jungbluth v. Hometown, Inc., 201 Wis. 2d 320, 548 N.W.2d 519 (1996), 94-1523. Steps that the grantor requires the dealer to take in order to rectify a deficiency must be reasonable. Al Bishop Agency, Inc. v. Lithonia, 474 F. Supp. 828 (1979). The notice requirement does not impermissibly burden interstate commerce. Designs in Medicine, Inc. v. Xomed, Inc., 522 F. Supp. 1054 (1981). Remedies for termination should be available only for unequivocal terminations of the entire relationship. Meyer v. Kero-Sun, Inc., 570 F. Supp. 402 (1983). The insolvency exception to the notice requirement did not apply to insolvency that was not known to the grantor at the time of termination. Bruno Wine & Spirits v. Guimarra Vineyards, 573 F. Supp. 337 (1983). Assignment of a second distributor in Wisconsin did not breach the agreement or cause a substantial change in the competitive circumstances of the nonexclusive dealership agreement in violation of s. 135.03. However, the defendant's assignment of a second distributorship was a violation of this section because it caused a substantial change in the competitive circumstances of the plaintiff's truck blower distributorship and the defendant failed to provide the plaintiff with 90 days' written notice. Wisconsin Compressed Air Corp. v. Gardner Denver, Inc., 571 F. Supp. 2d 992 (2008).