Whipple R980 Oil Level/Change

I have been running my whipple 5 years now and the oil is starting to look a little milky in the blower... Do i drain front and back seperate? or in the front and out the back... I see a Fill plug on the snout and site plug in the rear... I was told Gear lube 80/90 if i remeber correctly...

 

Blower oil

There is no oil on the snout ( I hope that you have sealed bearings) ! On the back just drain thru the big cap and fill to half the oil sight , we use syntetic 30 wieght motor oil with no trouble.