fuel Injector cleaners anyone suggest a good one? other engine additives suggestions. on 2004 Volvo XC70

I just purchased a used Volvo xc70 and wanted any suggestions on what to add or do first with the engine and fluids. It has 138,000 miles and it has had the timing belt replaced at 98000. Anything else I should be aware of or do?

Asked by for the 2004 Volvo XC70
seafoam is good and availible at most parts stores