Engine Oil in my RVF - i think i have cocked up

buffalobisonhead · Post by **buffalobisonhead** » Fri Jun 10, 2011 12:43 am

Mistakenly I have purchased some 10-35 instead of the recommended 10-40.

Will using the 35 present problems in my RVF?

Should I return to shop and exchange like an eejit?

Look forward to hearing from you

code2006 · Post by **code2006** » Fri Jun 10, 2011 12:59 am

To be on the safe side just take it back and get some fully synthetic 10-40

999Gomerz · Post by **999Gomerz** » Fri Jun 10, 2011 6:50 am

The difference between 10w35 and 10w40 is bugger all. It is only the hot viscosity you are talking about and it is a very small difference.

It'll be fine.

Post by **Drunkn Munky** » Fri Jun 10, 2011 7:19 am

DO NOT put fully synth in a NC, your clucth will slip

Post by **skinnydog0_0** » Fri Jun 10, 2011 7:20 am

999Gomerz wrote:The difference between 10w35 and 10w40 is bugger all. It is only the hot viscosity you are talking about and it is a very small difference.

It'll be fine.

I run Castrol 1 racing 10w30 in my track bike and it's lovely

Lane · Post by **Lane** » Fri Jun 10, 2011 7:38 am

Synthetic oils don't cause clutches to slip, oils with friction modifiers do.

Post by **porndoguk** » Fri Jun 10, 2011 9:10 am

Drunkn Munky wrote:DO NOT put fully synth in a NC, your clucth will slip

80sman · Post by **80sman** » Fri Jun 10, 2011 12:25 pm

porndoguk wrote:
Drunkn Munky wrote:DO NOT put fully synth in a NC, your clucth will slip

Post by **skinnydog0_0** » Fri Jun 10, 2011 12:27 pm

Lane wrote:Synthetic oils don't cause clutches to slip, oils with friction modifiers do.

I cant find it right now, but Neo put a post in here somewhere about the difference in the oil make up and how it affects engine components, and i am pretty sure it states that fully synthetic oils will have no adverse affect on clutch slipping.
I use fully synthetic and have never had a problem and my clutch gets quite a hammering.

Same item but from another site;

This was taken from AMSOIL's site.
"Many people have the perception that since synthetics are more slippery than petroleum oils (which simple don't reduce friction as well), that wet clutch packs in either their automotive automatic transmission or motorcycle transmission will slip when using "super slippery synthetics". AMSOIL Synthetic Oils are no more "slippery" than petroleum oil. AMSOIL Synthetic Oils simply have a more uniform molecular structure which reduces frictional resistance better than the irregular shape and size molecular structure of a petroleum oil.

Look at it this way. Wet sandpaper removes paint as well as dry sandpaper does. The slipperiness of the water does not impede the sandpaper's ability to function. The same applies to the "slipperiness" of synthetic lubes in wet clutches.

If used dry, the sandpaper is soon filled with paint and no longer works- it slips across the surface without grasping the surface. If kept clean and free of paint, it continues to work. The lubricating/cleaning solution used can be water, soap, oil or any other liquid. The liquid's slipperiness does not affect the performance of the sandpaper.

It is simply not an issue. However, just as rinsing the sandpaper keeps it cleaner longer so it functions better longer, so the AMSOIL Synthetic Oils keeps wet clutch plates cleaner longer so they function better.

AMSOIL Synthetic Oils will prevent deposit buildup on clutch plates, therefore keeping the face clean and able to do its job in preventing slippage.

And, since synthetics are superior cooling agents to conventional petroleum lubes, using synthetics will help wet clutches last longer, too.

Petroleum oils have low resistance to heat and allow varnish and glaze to form on clutch plates, which eventually leads to slippage and increased heat generation and eventually failure of the clutch pack.

Also, AMSOIL motorcycle oils are specifically formulated without any friction modifiers for compatibility with wet clutch packs. AMSOIL ATF lubricants are also designed with specific coefficient of friction values to meet the requirements of each and every specification that it not only meets, but far exceeds.

Now you know the facts. The next time your buddy mentions using AMSOIL Synthetic Oils and Wet Clutches as a potential issue, you can explain to him exactly why it is simply not an issue."

I'm not biased towards other oils but in the case of synthetic oils being used in wet clutches I think synthetics are fne to use in wet clutches. Remember synthetics are no more slippery than petroleum oils. They are just more uniform in various temperature ranges than petroleum oils are, which, in turn, offers more protection.

HTH

Post by **Neosophist** » Fri Jun 10, 2011 1:14 pm

Yep it depends on the oil.

Fully synth (and even some higher grade semi-synth) CAR / Dry clutch oils contain an increased amount of molybdenum and other compounds that make the oil more slippery.

This is great on a dry clutch engine as less mechanical friction = slightly better MPG :-)

However, all oil that is suitable for wet-clutch motorcycles / synth or not shouldn't be a problem.

Fully synth lasts longer than natural oil due to its makeup.

If your engine doesnt require fully synth oil then using it wont cause it any harm, it will just last slightly longer and cost more money, this might be offset by the increased oil changes if your not changing it so often.

However, since it is of no real advantage in the majority of 80's/90's Honda bikes then I just stick with the much cheaper Semi-Synth...

I use Honda S9 or equiv (semi-synth 10/40)