Just replaced oil in Fulid 2 trainer with Miles Lubricant (ISO 46). It's sold by Grainger in 16 oz bottles. Drained 105 ml and refilled the same amount. Reduced roller load on wheel by rotating yellow lever one counter-clockwise rotation and performed a TrainerRoad ramp test. FTP dropped by 10% so I'll assume the fix worked and extended the trainer's useful life.