ecraiger
Being super geeky and technical, the manual does not state to fully insert the dipstick (compress the gasket) when checking the oil level - lightly touch the top of dipstick to oil line - or just touch colored part to oil line. Which is it?!

Have 40 hours on second oil change. Does it look like need to be changed or keep going to the 100 hours?

Thanks
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Cobranut
If not specified, I'd insert the dipstick to its normally seated position.
One way to verify is to change the oil and filter, adding exactly the specified amount of oil, run the engine for a minute, let it settle 5 minutes and see where the level falls on the dipstick. 
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78buckshot
Hi ecraiger, from the picture it appears as though you have a twin cylinder Generac, model and serial are always helpful so we can be more accurate. In the case of the majority of these engines you will fully insert the stick to check oil level. Keep in mind that if the generator itself is not sitting on a level base it will change the reading on the stick even if it is correct.
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Ron Goldstein Rongold
You insert the dipstick all the way until the shoulder on the stick hits the tube---Just like any other engine.
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ecraiger
Thanks. all. Any ideas about changing oil based on color?
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george6488
What color oil do you have?
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78buckshot
We recommend changing oil and filter once a year or 100-200 run hours whichever is sooner. Oil color will give you some indication but these engines run very clean due to the low carbon fuel. The oil is still tasked with the job of cooling and cleaning the internals of the engine and as with all modern engine oils the additive package will break down with heat and time. The oil in your machine looks good as far as condensation - no milky appearance. What is your location?, up here in Michigan we see an increased collection of water in the oil due to short run times and cold damp climate. At 40 hours of run time and if it's less than a year I would let it run, then follow the owners book recommendations.
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