starting to do oil and lubes with detailing.

I am seriously considering adding oil and lubes to my car wash and detail business. The area my car wash is in doesn't have a lube witin 4 or 5 miles and it is a heavily conjested, residential area.

Does anyone know of good resources where I can investigate this further?
Is there certain equipment I need to invest in?

I would start slow and do them by appointment only and as an upsell with the detailing.

Any help would be greatly appreciated.