Hi all
The book says 15W-50 - surely that's for Indian climate?
Do I really need that multi-grade here in the UK? I would have thought a 10W-40 would be ideal for summer use and 5W-30 for Winter. I live in the North East - we get a lot of wind and rarely does it ever get above 30 degrees C even in high summer.
You do have an interesting point. I personally use 15W-50 in my G5 (Electra) in north east of US where the temperature is colder than in India. Only in the last few days the temperature has reached upto 30C. In my experience, this grade of oil works very well in warmer climate (above 20C) as we have right now. The gear changes and running, everything is smooth.
A few weeks back, when the weather was cooler and I rode it when the temperature was about 10C, the oil felt a bit too heavy. As Ernie has posted that 10W-40 may also be fine until you hit 32C or higher.
From your naughty post upstairs, I get that you're in England?
Addendum; Just realized this is for a UCE (again). I would think a 10-40 would be fine until you get into the 90's or are stuck idling in heavy traffic a lot. The main thing is to use an oil made for motorcycles and change it fairly frequently.
I change my motorcycle oil more frequently than recommended by Owners Manual. I like the engine, transmission and clutch plates run in clearner oil. It will pay off in the long run IMHO.