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post #1 of 49 (permalink) Old 01-15-2012, 02:03 PM Thread Starter
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Synthetic oil in America

Hi.

Do any of you guys run full synthetic oil in your Triumph's. I was told not to use synthetic oil as it is far too slippery for the clutch. Is this true?

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post #2 of 49 (permalink) Old 01-15-2012, 02:21 PM
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No, it's not true if you use a motorcycle specific synthetic oil. I run it in both my Triumphs, no problems at all with clutch slip or anything else.

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post #3 of 49 (permalink) Old 01-15-2012, 03:46 PM
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They fill the America with Castrol 4S 10-50 synth at the factory. Should say something.

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post #4 of 49 (permalink) Old 01-15-2012, 04:49 PM
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Use a motorcycle specific synthetic oil. Standard synthetics for cars (diesel engine excluded) have friction modifiers which could harm your clutch. Diesel and Motorcycle specific oils don't have them (JASO rated) and are the best oils for combined engine/transmission lubrication.

The reason to use a synthetic oil is due to it's ability to maintain it's multi grade capability. Dino oils loose their mult grade capability rapidly. A 15w50 dino oil will become a 15 weight in no time due to the shearing action of the transmission gears which have little effect on synthetics.

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post #5 of 49 (permalink) Old 01-15-2012, 05:00 PM Thread Starter
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Thanks for the "good oil" guys.
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post #6 of 49 (permalink) Old 01-23-2012, 09:25 AM
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Having nothing to do with the oil itself, how often are most members changing the oil in their America/Speedmaster bikes? The 6000 miles specified in the manual seems a bit high, 3000 miles might be wiser. ?
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post #7 of 49 (permalink) Old 01-23-2012, 10:07 AM
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I aim for 3000 to 3500, but of course a lot depends of the quality of the oil.

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post #8 of 49 (permalink) Old 01-23-2012, 12:53 PM
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A local automotive program that airs on weekend radio says that many people believe that using synthetic oil means they can go twice as long between changes. The mechanic in charge of the show says that's not true; so do I.

http://www.agcoauto.com/content/news/p2_articleid/212
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post #9 of 49 (permalink) Old 01-23-2012, 01:28 PM
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I've been running Amsoil in my '07 Sprint ST for the last 4 years with absolutely no problems.

reference:

http://www.amsoil.com/a/synthetic-motorcycle-oil

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post #10 of 49 (permalink) Old 01-23-2012, 01:54 PM
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Amsoil is good as well as any major brand synthetic (or semi-synthetic) four-stroke oil that meets the Motorcycle standard JASO T 903 MA specification and a classification of SG or higher. Viscosity is of course also important, the grade depending in the main on your geographical location / atmospheric temperature in your riding area.

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