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I recently made the switch to Mobil One 10w-40 synthetic oil in my Vulcan 900 Classic...I've noticed that while riding that my bike seems to run hotter. I know it's summer now, but I've never noticed the heat coming off the front of my bike. Has anybody else had this problem? Thanks for your help!
 

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does it seem to run hotter, or does it actually run hotter?

Get a thermoprobe (craftsman multimeter works, mine has one with a wire... they have laser guns that tell temperature if you like techy stuff) and record ambient air temp (shaded object near MC), and a specific spot on engine (just above exhaust port) at idle after a 10+mile easy ride.

Switch oils, let engine fully cool, and do this all over again. Compare temps. Being summer temps are higher, and even though our bikes are water cooled, I think the cooling fins on the cylinders do a lot of cooling as well. Hotter air means less efficient cooling from the cooling fins.
 

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Yes, this is possible. This phenomenon can be compared to putting in higher octane fuel than usual. Synthetic oils are suppose to withstand higher temperatures without breaking down its molecular structure. Much like higher octane fuel, the synthetic oil in the engine could possibly create an exothermic reaction of a higher temperature. It is important to note, however, that synthetic oil makes your actual internal parts of the engine run COLDER. In fact, most synthetics make the engine run about 10 degrees colder.

Imagine a household fridge running at cold level 5/10 (higher number = colder). For he fridge to cool its insides, it must exhaust heat (just like an AC unit). If you set the fridge to 10/10 (as cold as it can), it will without a doubt exhaust even more heat. A similar idea can be occuring in your engine.

As the posters before me recommended, checking an actual measurement for temperature might help. Keep my example in mind though; the internal parts of your engine might be cooling faster and exhausting more heat
 

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I've been running synthetic since about the 900 mile mark, now at 8500 miles, with no trouble at all, including 98* heat with a 110 heat index.
 
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