Dude! Where's your respect for re-inventing the wheel! There's always a newcomer seeking enlightenment in a current thread however;I take your point.
Cheers
Cheers
Then my question is: What type of oil filter do you have, and what replacement or cleaning interval? What type of riding, city stop and go, highway or country road? I guess the Missisippi climate is rather warm most of the time, at least above 20C ?
It is my understanding that the first number in front of the W is the base oil. Polymers are added to make it behave more like the number after the W when hot. I know this is oversimplification, but all I need to know. As you break down the oil through use, it works its way back to 10 or 20 as you selected. It’s those polymer chains that break, plus all the debris resulting from engine operation that necessitates oil replacement.So what is the importance of the 10W or 15W part of the specification. I realise it refers to the viscosity cold, but what does this means in terms of lubrication on a cold engine?
So is 10W40 a "bad" deviation from 20W40?
Yamaha specified 20W40 for the XS650. To my thinking, the 20 is more important than the 40. Regular Yamalube is now 20W50. With regular frequent oil changes, it shouldn’t make that much difference, IMHO. Clean and slippery is the important part.So is 10W40 a "bad" deviation from 20W40?
Kudos to you, Tiesco, for studying your manual !I just took another look through my manual and I did not see anything. I definitely remember reading something like that but it was probably in some other manual about some other vehicle. So perhaps we are both imagining things.
Kudos to you, Tiesco, for studying your manual !
There is so very much to learn there.
I have an unknown condition XS650 on the lift. I serviced the engine. I just topped it up with the Walmart brand 20W50. It’s less than $14 for 5 quarts. It’s certainly fine until I know what I have. Maybe fine, period.