napkin math wind turbine vs oil fired plant

Numbers vary a lot but lets say wind turbines produce on average 35% of nameplate capacity. 2MW towers are by far the most common on shore turbine size so our hypothetical average tower produces about 6100 MWh/year.

Gearbox oil capacity also varies but the higher end of the numbers that get thrown around is about 150 gallons, replaced every 5 years or so. So about 30 gallons per year or roughly 200 MWh per gallon.

The EIA says on average 0.08 gallons of oil is burned for one kWh so 80 gallons per MWh. At 80 gallons per MWh that's 488,000 gallons(11,619 barrels) that need to be burned in a year to match a 2MW wind turbine's 6100 MWh/year

sources:
wind turbine oil replacement interval https://energycentral.com/news/positive-outlook-wind-turbine-lubricants
wind turbine gearbox oil capacity https://www.gear-sprocket.com/blog/how-much-oil-does-a-wind-turbine-gearbox-hold-102/
Amount of oil burned as fuel per kwh https://www.eia.gov/tools/faqs/faq.php?id=667&t=6