GT61 TURBO ZX14 wrote on 05/24/18 at 04:48:36:If you can understand what they're trying to get at is there trying to go for emissions and less parasitic load the tolerances are darn near the same as they were 20 years ago on the bearings all they're trying to do is get emissions now and how do you do that by putting thinner oil in there for Less parasitic load so the motor easily pass emissions tests I guarantee you my ZX-14 as turbo has tighter tolerances than this Suzuki Savage ls650 and I run 20w50 weight in that because of the number one enemy to Motors is heat and what happens if you don't have a good thin film between the bearing and the crank it'll spinner touch and then it takes chunks out grooves on hotspots in the bearings remember the Suzuki Savage is an old-school motor that's are cooled
You seem to be confusing "efficiency" with "emissions". A lower viscosity can help reduce drag and provide more efficiency.......I don't see how it has any affect on emissions.
You also seem to be ignoring the fact that oils can be too thin - or too thick for an engine, and both can have a negative affect. Verslagen has proven that 20W-50 results in higher operating temperatures in the Savage.
If you are open to learning and willing to accept reality - you can do an internet search and discover that you really should be using the oil viscosity that your engine was designed to operate with...running a 0W-60 oil in your car designed for 5W-20 is not doing you any good. (Contact your Motul folks and see what they recommend you use). When an oil is thick it may not be pumped in sufficient volume to lubricate and protect the engine.
Amsoil also states the following on their webpage:
https://blog.amsoil.com/what-does-viscosity-mean-and-how-does-it-affect-your-engine/
How does viscosity affect engine protection?
So what does this all mean to protecting your engine? Put simply, viscosity is the most important property of a lubricant. How lubricant viscosity reacts to changes in temperature, pressure or speed determines how well the oil protects your vehicle.
Lubricants with too low of a viscosity for your engine may cause:
Increased metal-to-metal contact
Increased friction and wear
Increased oil consumption
Leaking seals
Lubricants with too high of a viscosity could also hurt your engine by causing:
Increased fluid friction
Increased operating temperatures
Poor cold-temperature starting
Reduced energy efficiency
Suzuki does allow the use of 20W-50 when temperatures are above 14 degrees F.....I really can't imagine trying to get my Savage started with oil that thick on a cold winter morning. The opinion of the senior members of this forum is that you should be using 10W-40 or 15W-40 "dino" oils - or 5W-40 in synthetic. Rotella T4 and synthetic T6 do a good job and are affordable and are safe for wet clutches in their current formulation.
Other oils can work as well and perhaps better - few oils can be as easy to find locally or as cheaply, and other oils can be considerably more expensive. It is impossible for us volunteers to constantly monitor the changing formulations and suitability of all the available oils. Your Motul most likely is a very good oil as it is an Esther based synthetic......I probably can find it on a store shelf within 100 miles of where I live.