225 4 stroke -- gas mixing with oil

[si boy]

originally thought is was the temp sensors running the engines cold, causing the engines to shoot more gas into the engines, resulting in the gas getting into the crank house and then over flowing into the oil reservoirs. put in new temp sensors, but it did not solve my problem. oil/gas will flow out of the dipstick hole when checking the oil...any thoughts as to what the problem is? occurs on both of my engines.