Which oil to use in Generac whole house generator installed around 2008?
We've had storms and power outtage so our Generac has been running non-stop for 5 days snd likely will need to run another week. We had it maintained less than a year ago but I'm afraid because of the constant use we may need to add oil. I don't have the brochure anymore; what type of oil can I add to keep it working?