I might be out of my league, if there weren't so many orders of magnitude in my favor.
We're comparing oil used for lubrication to oil used as fuel.
But, if you insist, let's compare. How many barrels of oil per megawatt hour?
A standard oil plant uses about 80 gallons of petroleum per MWH.
www.eia.gov
So, to make 6,000 MWH, you need about 480,000 gallons of petroleum.
A 2.5 to 3 MW turbine will make about 6000 MWH in a year. It will also need about a thousand gallons of lubricant. (700 gallons every 9-16 months)
Wind energy continues to grow in importance in the US and around the world. With about 380 billion kilowatt-hours produced in the US in 2021, it accounted for
www.savantlab.com
So, per unit of production, the fossil plant is using about 500X as much petroleum.
In other words, windmill lubricant is a relatively small factor. Not zero. But smaller than the environmental costs normally involved in making that much power.
You should have gone for concrete. That 2.5 MW turbine has a 800 ton concrete base. At 900 kg CO2 per ton, that's 720 tons of CO2- the same as is released from burning 80,000 gallons of fuel oil. It'll take you 80 years to get a number that big from lubricants.