No, servicing your vehicle at a non-Isuzu approved service outlet will not adversely affect the warranty on your Isuzu. However, the maintenance must be completed in accordance with the manufacturer’s recommendations and the service parts used must be of equal quality to original components and fluids.
The replacement parts and fluids MUST comply with the specifications as shown in your owners and drivers manual. Any failure of genuine components found to be caused by non-genuine parts is not covered under warranty.