Oil for Generac GP2500I

[Astro_Guy]

I bought a GP2500I today and I asked the guy what oil was recommended . He told me straight 30 weight . I thought that was kind of odd but when I looked in the manual straight 30 weight was ok for the temperature range that I would use it in . He gave me a quart of Kawasaki branded SAE 30 so I guess that's what I'll use when the time comes to change it . Any thoughts ?

Personally I would not use a 0w-X oil in any OPE. Try to find the HTHS specification, and keep it above 3.5 by all means. Straight 30 was the recommended air cooled OPE oil for decades. 15w40 oils perform a lot like the old sraight 30 in terms of HTHS viscosity.

 

[rumcapital23]

i've run 15w40 in my Honda gennies for days at a time. the last time was for 18 days straight with 50 hour oil changes. i'm sure that i could have run them to 100 intervals but i had excess oil on hand for the eighteen days. i also ran some SAE 30 straight viscosity oil as well.

the big Honda powered Winco would run about 10-12 hours a night. the Honda EU2000i would run from 6am to 6pm average. so a 12 hour day. then the Winco would take over from 6pm to 6am average. the Winco ran the AC and everything in the house and consume 7 gallons a night.

my moms EU2000i was running for 24/7. only turned off on oil changes. i would even refuel while running. lol

the 15w40 and the monograde 30 oil protected my air cooled equipment, nicely.

for light duty use i would def run 10w30 if that the only oil i had on hand. for hard use where i was running my gens at max load, during an emergency, i would only trust 15W40 or straight 30 or 40.

*had neighbors gens breakdown during the 18 day power outtage due to using 10w30 and 5w30 oils. and lack of checking the oil levels.*