What kind of oil to use in a Coleman HP3500 generator

sae 30 I use GTX

Powermate doesn't have an owners manual listed for the PM0645250 on their website.

Since wintertime is a good candidate for power failures I would recommend using a good synthetic 5w-30 oil as it is a good year around oil. This would make starting much easier during the cold weather

depends on the temerature 40 and above SAE 30
0 to 40 SAE 5w-30 to 10w-30

Hi, no you don't. It is a four stroke engine and uses engine oil in the sump only. Regards Phil.

we need to know the make of the motor....most use a SAE30 four stroke oil....not sure of the plug without knowing the make of motor.

20:1 that's 1/4 pint to a full tank of fuel.

10w40

Hi,
Here is an answer I posted on this some time ago,
you may want to check out the other question Captsteve asked as it leads to another method of flashing the generator.

Regards,
Carl

You need a quart of regular old SAE 5W30 motor oil with detergent.
The engines on these generators are more or less the same as a lawn mower.
Don't forget to service/change the air cleaner when you change the oil, that should keep your generator producing full power.

Regards,
Carl

Use 10/30 weight oil fill till : " if it has a "dipstick" fill to middle of hash marks" if not, There in the hole for the oil filler cap their is a knotch cut out of the theads for that cap. fill to just below the top of that knotch . drain plug on bottom of crankcase