Dave
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SuzukiSavage.com Rocks!
Posts: 18137
Camp Springs, Kentucky
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I don't know what you mean by "start up damage". Multi-grade oils (5W-50, 10W-40, 15W-40, 20W-50,etc.) aren't going to cause any damage just because one has a lower "W" rating than another one does. It is currently summer and the temperatures are hot....the W rating really isn't in effect until the temperatures get very cold.
I run Rotella T, 15W-40. I sit on my bike, turn on the key, start it up, use the throttle to keep the rpm up about twice the normal idle speed for about 15 seconds to get the oil moving around, then I let it idle down, click it in gear and I ride off. I don't use a lot of throttle for about 4-5 minutes while the bike is getting warm. My engine doesn't need the choke in warm weather to start.....so I don't have to bother with that until the weather drops down to around 50, and I seldom ride when it is that cold.
If you want to run a conventional oil in the summer....Rotella T 15W-40 is a good oil, and you can also use 10W-40. You can run 20W-50 if you want - but there really isn't any benefit from running oil that thick that I can see - maybe if you spent hours on the interstate or did a lot of parades where the engine might get pretty hot.
If you want to run a synthetic oil.....pick one that has a 40 or 50 rating, and don't worry that the oil is 5W or 10W or 15W or 20W...those don't mean anything when you are riding in the summer. Rotella T 5W-40 is a good oil and very affordable, and work just fine in the Savage.
The 5W or 10W or 15W rating is an indicator of how the oil responds when the outside temperature is cold. So the lower the number the easier it is to get your engine started in cold weather. You seem to be confusing this with the oil being "thinner" at warm temperatures - which is not necessarily true....you need to pay attention to the 30/40/50 number when considering how the oil performs when the engine is hot.
Suzuki recommends this, and there are no 5W ratings in this chart because it does not consider "synthetic" oils....only conventional petroleum based oils. (It is fine to run synthetic 5W-40 oil in the Savage....they just didn't include it in their chart).
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