...How much of a job is it to change the oil myself? I take the motorhome to Oil Can Henry's for oil changes and they use Mobil 1 synthetic in the engine, is it okay to use the same thing in the generator? its a Onan Microquiet 4000
I've got that model and I changed mine a couple of weeks ago. It's easy as long as the RV manufacturer didn't install it with a brace blocking the drain hole. The manual instructions say it all... [my comments in brackets]
1. Run the engine until warm, stop it and remove the oil fill cap.
2. Remove the oil drain hole cover in the base [2 screws], place a pan underneath and unscrew the drain
plug [a hex-head bolt]. Let all oil drain from the engine and then secure the drain plug. Torque the
plug to 21 lbs-ft and secure the cover.
3. Refill with 1.6 quarts (1.5 liters) of oil. See ENGINE OIL RECOMMENDATIONS [table below].
Check the oil level and add or drain oil as necessary.
4. Screw the oil fill cap back on securely.
TABLE 1-1. OIL VISCOSITY VS. TEMPERATURE
TEMPERATURES SAE VISCOSITY GRADE
32° F (0° C) and higher -- 30
10° F to 100° F (−12° C to 38° C) -- 15W-40
0° F to 80° F (−18° C to 27° C) -- 10W-30 or 10W-40
−20° F to 50° F (−28° C to 10° C) -- 5W-30