Remove seed pods and white seams from peppers. Cut lengthwise in 3/4-inch strips. Place in a bowl and cover with boiling water. Let stand 5 minutes. Drain. Combine vinegar, water, and sugar in saucepan and simmer for 5 minutes. Pack peppers in hot sterilized pint jars. To each jar, add 1 clove garlic, 1 teaspoon salad oil, and 1/2 teaspoon salt. Pour hot liquid over peppers to within 1/2 inch of top of jar. Make sure vinegar solution covers peppers. Cap each jar at once. Ready to eat in one week.