All correspondence must be made through the Vendor Portal. Specifications include, but are not limited to: It is the intent of this specification to describe the minimum requirements for the purchase of lubricants and fluids for use in the diesel engines of Milwaukee County Transit System buses. All items or features not specifically mentioned which are necessary or which are regularly furnished to provide complete service, shall be furnished by the successful bidder at the bid price and shall conform in quality of material and service to that usually provided by the engineering practice indicated in this specification. Milwaukee County Transit System is managed and operated by Milwaukee Transport Services, Inc., and shall be referred to as MTS hereinafter.