5w -40 Rotella  T-6 is not to light an oil for use in your bike 5w is tested to still flow at -25 degrees,  10w at -20 ,15w at-15 degrees .I don't feel that many of us will be starting our motors at these cold temps, but the fact that a 5w oil will be thinner at cold start up means that the motor runs "dry" for a shorter time before oil starts flowing through the oil passages ,that lessens wear and allows the oil to warm faster.If this oil is good enough for diesel tractors ,bulldozers and the like ,in cold weather ,why would you think it's to "thin" for our use.

Gary_in_NJ wrote on 09/02/17 at 11:56:35:


The "40" rating is done at 210 degrees - so at engine operating temperatures, the 5w-40 and 15W-40 are both operating as "40 weight" oils....there shouldn't be any difference.

At "winter" temperatures - the 5W rated oil does not cause as much drag as the 15W rated oil.  This could be a concern if you leave your bike outside when it is 10 degrees - but for us warm weather riders it isn't of any concern. The weird part is the testing doesn't actually give you a cold temperature where the testing is done...so I don't know if that is at 10 degrees....or -10 degrees!  

http://www.upmpg.com/tech_articles/motoroil_viscosity/


Here is what Suzuki recommends for the Savage.....and it really doesn't matter to me if the 'W" number is 15, or 10....or 5 as I will never be riding at temperatures where that has any affect.  The numbers on the chart tell me that Suzuki has not included any synthetic oils - as the synthetic oils generally have a much wider range between the numbers (5W-40, 5W-50).  (Mobil1 appears to limit the ratings on their synthetic oil to the numbers listed in the owners manuals (0W-20, 5W-30, 10W-40, etc) to avoid confusion about what oils can be used in your engine.

I was not trying to talk you into a synthetic.......I am perfectly happy with the Rotella 15W-40 oil, and I really doubt that I will every wear an engine out while using it.  Unless I start riding more than 3 or 4 thousand miles a year - I will never get the kind of mileage it takes to wear out a motorcycle or car in what is left of my lifetime.

JOG, I'll confess that the only foreign language I took was the requisite 2 years of French. However, I did read the book "How to Speak Texan". But, after 40 years the only phrase I retained was "tar arn". Which roughly translates in English to something like "tire iron." Do East Texans speak the same language as the rest of Texas?

Dijid ya eet yet?

Naw.....didju?

Dijwan 2?

Awwright!

Dave wrote on 09/07/17 at 03:26:18:


That is easy. Now, rural Ky near the TN line is where it starts getting interesting. The word pronounced like "flair" could mean the small blooming plants around your house, or the white powdery substance mixed with milk and eggs to make dough, or it could mean those little sticks that you light and put down behind your vehicle when it breaks down on the road. And all words that end with a vowel are pronounced as if they ended with a "y". Like tobacky for instance.

batman wrote on 09/09/17 at 22:26:07:


Wahhaaa ?