Parts 6L ISL Oil Cooler Fit For Cummins Diesel Engine 3974815 3918175 3906296. Fit For Cummins Diesel Engine Parts 6L ISL. Product Number: 3974815 3918175 3906296. These charges are thebuyer’s responsibility. If you find any dissatisfaction or questions during the shopping process, please contact our merchants at the first time. Please rest assured that we will handle your feedback with a positive attitude and professionalism! (excluding weekends and holidays). Please confirm your valid address before placing an order. The global standard arrives in about 7-15 days. When you receive our products, we value your feedback on your experience. If you find any dissatisfaction in the process of using the product, please contact our merchant at the first time. Please be assured that we will handle your feedback with a positive attitude and professional action. It is vital that you communicate with us before you feel dissatisfied.