Not sure clutch is a good example as they often consider it a wear item like brake pads and thus don't cover it anyway. Really not sure how BRP deals with them under BEST ----:dontknow:
Very good point. The clutch is a wear item. Even using the absolute, by the book stuff probably will not get you any warranty coverage there. Especially if it's just the friction disks that need replacment.
Maybe a defective clutch basket, shaft bearing, etc. would get coverage.
But the idea, of course, is to avoid unnecessary problems so you don't need the warranty coverage.
I don't think we really disagree...and my point may have been too strongly stated. The idea is that a 20W-50 is two cold viscosity ratings, and one upper viscosity rating, thicker than the recommended oil. That is a lot in my climate...although maybe not so much in a hot place like Florida, Arizona, or Texas. I would worry mostly about possible shifting issues with an SE, but there also
could be clutch related differences, as well as close tolerance clearance issues, excessive oil pressure, and even oil flow problems. These types of problems would be more likely with a dino oil than a full synthetic. The most likely result would actually only be slightly decreased fuel mileage due to added engine friction. The owner should, of course, realize that warranty coverage could be jeapordized, but that situation is not all that likely, IMO. The bottom line is that the owner has to evaluate the risks and trade-offs, and make his/her own decision. I might go one step away from the manufacturer's recommendations, but I would hesitate to move two...at least up North. I would also hesitate to use an API SM oil that is prohibited by the manufacturer. That is me. Your results may vary.
I thought this is where you were coming from, so we do agree after all! Since a 20w-50 oil is unlikely to create any warranty issues it would be highly unlikly, and unjustified, for BRP to withhold warranty work for that reason alone.
I've run 20w-50 in motorcycle wet clutch engines that called for 10w-30, 15w-40 with no problems at all. Took just a bit longer for shifting to be smooth on colder days but I wanted the extra protection for long desert runs.
As far as shifting on the SE, I have my doubts that 20w-50 would be a problem but if it were, replacing it with a lighter weight oil would be the extent of 'damage'.
I do not intend to run 20w-50 in my Spyder but if that's all I had at the time I wouldn't worry about it either.
And, of course, we always agree that an oil that does not meet the required API rating be used. But some variation in viscosity (to the heavier side) and API ratings are two very different things. One is simply less than ideal and the other is an invitation to trouble, both with the bike and with warranty coverage.
Stick to the recommended rating or risk thouusands. Your choice.:doorag: After all, I thought we are doing this to save $$$, not trying to blow up the bike and spend $$$$$ more.
This really is my point. I am not saying people should use 20w-50 oil. Only that it isn't going to blow anything up, it isn't going to cost you or void your warranty. Just trying to get a right perspective on what viscosity does, or does not do, in an engine.
Viscosity and API ratings are 2 very different things. If you stray from the correct API rating then you really are asking for trouble. But bumping up the viscosity some isn't going to give you big issues. Even with the SE I'm not sure shifting would be all that negatively affected. They build these with a fair range of effective viscosity compatablity.
Heavy [heavier] oil means more fiction which means more ware, Most engine ware occurs at start up, And in cold climates heavy oil will not flow well on start up. Also heavy oil will decrease MPG's Which means the engine is working harder at any given speed.
Not exactly. I think we are lumping fluid drag (which is a non-wearing friction) and metal to metal contact (friction which causes wear) together. They are not the same thing.
A heavier viscosity actually puts more distance between metal parts (like gears, pistons/rings to cylinder wall, bearings to race, etc). This will give you less wear (in conditions where a lighter viscosity lubricant will fail to prevent metal to metal contact) or the same amount of wear in conditions where the lighter lubricant is sufficient. But it isn't going to give you more wear.
Engineers design friction parts and speck out lubricants so that ideally, there is never any metal to metal contact. They speck out the lightest grade oil that will achieve this because of the advantages that ligher oils give you. Going too light will increase metal to metal contact giving you a shorter life span. Going to heavy will save your parts but reduce fuel mileage and possibly giving less than ideal functionallity (like shifting).
The heavier oil will give you greater fluid drag. This increased drag is easy to understand. Stir a bucket of water and then stir a bucket of paint. The paint will take a bit more effort. Same thing happens on a smaller scale in an engine. It takes a bit more effort and your fuel mileage may suffer slightly. Maybe so slighlty that you don't even notice.
So yes, technically the engine is working harder with a heavier oil. But putting a larger windshield on your Spyder will probaby give you 10 times the added drag, more wear and affect fuel mileage much more than using 20w-50 oil.
Heavier oil will also increase oil pressure. But there is releaf valving in the pressure system that prevents overpressure so this is really not an issue.
What the engineers do is create a pump that will deliver ample oil and oil pressure at idle. With increased RPM you're going to get increased flow and pressure. Our Spyders go from about 1500 RPM at idle to over 9,000 RPM. Even with 5w-40 oil your are going to exceed the desired oil pressure at 9,000 RPM with a closed system. Normally there are at least 2 releaf systems to bypass oil once maximum oil pressure is achieved. 1 in the Oil Filter system and another in the oil pump or somewhere else in the system.
It is true that the lions share of wear comes at cold start-up. But a heavier oil will cling to parts (not run off) much better than a lighter oil. So at start-up there is less need for immediate oil delivery with a heavier oil than with a lighter oil. This is one area where a full synthetic oil shines. Leaving a better protective shield on parts for a longer period than standard oils.
I am sure we have exceeded :bdh: specs with this tread but you never know till you give it a try.