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I recently bought the 620 monster for my wife. This one has a wet clutch where my 748 has a dry clutch. I run synthetic oil in the 748 but have heard of problems w/ synthetic oil and wet clutches. What synthetic oil is everyone running around here. What will work good w/out making the clutch slip.
Thanks in advance.
 
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I run Mobil 1 in my wet clutch,so far so good.
 

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I've run motorcycle-specific synthetics in all of my newer bikes that have had wet cluches. (Mobil1 and Silkolene...)Absolutely no problems.

You'll get folks who have had great luck using nonmotorcycle-specific synthetics that have had equally good luck. Then there are those who have experienced clutch slippage using the same type of oil.

If you're the conservative type, then go with a motorcycle-specific synthetic...
 

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Most folks are running some brand of synthetic. As many opinions as riders. Any brand should work as long as you stay away from "Energy Conservation" labeled oil. And, as long as you use 15W50 or 20W50 you will not be in the "energy Conservation" range.


I recently bought the 620 monster for my wife.
 

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Even HD recommends synthetic in the primary where the clutch lives... now that they sell synthetic. I made the swtch on an EVO and a Twincam without a problem with either clutch.

My favorite piece of BS synthetic oil "advice" is the warning not to use it because it is so slippery that the bearings dont have enough friction to spin and you will wear flat spots on your bearings ??? ???
 

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Beware of synthetic oil, it can do terrible things to you and your beloved motorcycle. It will not only leak out of your engine faster than you can put it in, but it will also cause your oil filter to clog and implode, ddumping debris and dirt into your lubrication system. It also will make every part of your bike permanently slippery because of its linear molecular chain dispersion action. Then it will leak onto your kickstand causing it to retract automatically, dropping your bike on the ground! But that's not all...

Synthetic oil will round off your gears and spin your bearings. It will also splatter onto your seat causing your girlfriend to fall off in the apex of a turn and she'll never ride with you again. Synthetic oil coats your sight window and your timing window with a whitish pro-emulsification additive that is both non-removable and highly corrosive. Synthetic oil will completely leak onto the ground overnight and your dog will drink it and die.

Synthetic oil will wear out your tires and make your battery leak. It will give you the desperate need to urinate after you put your full leathers on and then jam your zippers shut. It will contaminate your gasoline causing your bike to stall on railroad tracks and accelerate uncontrollably near police cars. It will make it rain during rallies and on weekends. It will lubricate four timing belts causing them to jump teeth and break your valves to bits. Synthetic oil chemically weakens desmodromic valves and causes the clearances to change every six miles. Then it melts the black soles of your riding boots night before you walk across your new carpeting.

While riding past groups of attractive women it will cause both of your handlebar grips to slip off at the same time so you smash your windscreen with the bridge of your nose. It also causes your swingarm to crack, your studs to break, and your rotors to warp, and then it voids your warranty by changing your odometer reading to 55,555. It also dries out your wetclutch and wets your dryclutch. It makes your clutch slave cylinder seal fail in the heaviest traffic on the hottest day of the year while putting an angry wasp in your helmet for good measure.

Synthetic oil hides your 13mm socket and puts superglue on your earplugs. Synthetic oil will scratch your faceshield and make your gloves shrink two sizes night before trackday. Synthetic oil stole your neutral and sold it to the Chinese for $1.25. Synthetic oil will make you grow a tail.
 

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Don't pay any attention to Jeff H., he's probably on crack again. I've used Mobil 1 car oil (15-50)for many years, in about 8-10 different wet clutch motorcycles, 4-5 different brands, over about 200,000 miles. No problems whatsoever.
 

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Jeff, it will also stain your riding gear.
 
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