RV Repair: Onan 5000 Generator problems, long periods of time, power regulator

Question
Sir,

I am having problems with my 1997 Onan 5000 generator. It has 2311 hours, has had the oil changed every 125 hours, the plugs, air filter and fuel filter changed every 750 hours. I started running a 1/4 of a quart of Lucas Oil Stabilizer in it at about 300 hours as I run it for very long periods of time in hot weather (Arizona) during summer due to having two dogs onoard. I was having trouble with oil foaming, the Lucas totally solved the problem and works great! I do all of my own work. My problems started about 300 hours ago. I started noticing more blow by and the air filter started getting oil soaked and the Gen started dying in cold weather. Now, it starts just fine and runs perfect for about 10 min, then starts running rought, then either dies completely and won't restart or starts racing and power surging, then dies. Sometimes it pops the fuses, sometimes it just dies. If I let it sit for 10 min, it starts right up and runs great for a few minute then does the same thing again. It does this mainly at night and sometimes it works perfectly for several hours before doing it. I do notice the carb is getting very oil soaked but the plugs have no oil on then and only very normal moderate carboning. My questions are: what could be causing this and can I clean the carb out with carb cleaner, is that the cause, why so much blow by, I only use Castrol GT 30 WT heavy duty oil. I been told by a couple Onan techs that sets with 2000+ hours do have blow by and it is normal and I've been told by others techs that they should not, it is not normal. Who to believe???? What other services does the set need? Is there a voltage or power regulator that could be going bad, brushes that need to be replaced??? Thank you for any help and advice you might be able to offer and thank you for volunteering your time to help me...a do-it-yourselfer idot!

Answer
Troy
Thats a big question.
With that many hours on the rings, you sure will have some blow by.
And the plugs would not show oiling if they were too lean.  
One of the areas to think about would be the condition of the fuel lines.
As the fuel lines age, they tend to dry crack on the top of the line.
It goes unnoticed because it does not drip raw fuel just gives off a vapor.
The drying is caused by fuel vapor in the top of the line and that ages the rubber. The cracks expand and contract at different rates and at different temps, allowing small amounts of air to enter the line when under load. The air entering the line causes fuel starvation and that leans out the carburetor right before it runs out of fuel(which can take a few minutes due to the length of the line) Leaning out, increases the RPM, which in turn over volts the GEN-SETS output and blows the breaker.  
But Thats just an educated guess.
Check your lines.
Hope it helps.

Thom