The Predator 3500 from Harbor Freight is a popular and highly rated generator, but just like any product, a few users have reported problems with it.

Predator line of generators has been updated and improved with even more features, greater durability, longer run times and increased reliability Harbor Freight Tools Predator generator line ...

Every Predator generator sold by Harbor Freight is equipped with the CO Secure framework. This is indicated by a large warning light present on the generator's control panel.

The recommended engine oil for any of the Harbor Freight Predator generators is SAE 10W-30. Depending on the model, you'll need about 0.26 to 1.3 quarts.