Hastings Company recorded the following expenditures during the year with regard to its delivery van: 1. Changed the engine oil 2. Repainted the van 3. Overhauled the engine that is expected to increase the useful life of the van 4. Repaired a dent in a fender 5. Converted the van to run on a biofuel with an estimated annual fuel cost savings of 30 percent. Required: Determine whether each of the above expenditures is a revenue expenditure or a capital expenditure.