My options on hand: T4 15W-40 T4 10W-30 T5 15W-40 T6 5W-40 Delo 5W-40 Delo !5W-40 Which should I use for break-in period? Stick with the Honda Recommended 10W-30 or go with the T4 15W-40? What would you guys use? The plan so far: 10 minutes for warm-up, with no load, eco-mode on. 2 hours 400 watts eco-mode on 2 hours 800 watts eco-mode on 2 hours 1500 watts eco-mode off Drain, the oil and refill with T5 15W-40 at 50hour intervals. Thanks for responses and recommendations.