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Discussion Starter #1
I'm feeling like I went nuts lol. Can't tell when the last oil change was done. Or what oil was used on top of it.

I just changed the neutral safety switch because it was leaking today. I also changed the oil with a Yamaha one.

I ended up running rotella conventional oil 15-40. I dumped in 3 qts and took it around the block. My clutch never sipped before and it grabbed normal. So it rips fine in all the gears maybe a little better. However in decel it doesn't feel like it has the same back pressure or the clutch is slipping now. Maybe I'm crazy lol. Does this sound insane?





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Rotella T conventional is jaso MA rated, so that's not going to cause your clutch to slip... shift into a high gear at low speed then grab full throttle. You'll find out if your clutch is slipping, quick...

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Your bike has a wet clutch, a heavy duty diesel most certainly does not.

I would dare to say that this is the primary reason why we are using motorcycle specific oils in our bikes, not plain motor oil.

Go get a proper oil with the correct additives for wet clutches and drain that heavy duty diesel oil asap.

That said... The rotella t probably won't damage your engine and should be safe to run but it is definitively causing your clutch issues.
 

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Your bike has a wet clutch, a heavy duty diesel most certainly does not.

I would dare to say that this is the primary reason why we are using motorcycle specific oils in our bikes, not plain motor oil.

Go get a proper oil with the correct additives for wet clutches and drain that heavy duty diesel oil asap.

That said... The rotella t probably won't damage your engine and should be safe to run but it is definitively causing your clutch issues.

The main issue with using non motorcycle oils is that automotive oils have modifiers (zinc) that are good for engines and bad for wet clutches on motorcycles. This is also true for synthetic oils.

Rotella T does not contain the modifiers.

I use it with no issues on clutch slip.

Clutch slip is easy to check for: full throttle in high gear during your bikes powerband. If you hear (or see) bikes rpm increasing significantly faster than speed, then you clutch is slipping.

Clutch slip is progressive, so you would first notice it at top gear with two up riding. Continued riding will eventually cause you to notice with one up top gear riding. Eventually, you will notice the same down a gear, and then during hard acceleration through your gears.

The wrong type of oil causes clutch slip without the progressive aspect. You will notice clutch slip accelerating through the gears within 50 to 100 miles of the oil change. According to my reading, switching to non modified oil will eventually wash out enough of the zinc to allow the wet clutch to work well again.

On the topic of "feels like less decel breaking after the oil change", my only comment is that decel braking is a relative thing. On my bike, if I blip the throttle too much on a downshift, I get a jump forward, before any kind of decel effect. (VMax likes to go, not stop). Point is, decel is relative and not a good indicator of clutch slip.

Hope this helps!

Cheers


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i curious as to why you chose that particular oil or was it something you already had? either way it wouldn't cause clutch slippage. the more weight coverage an oil has the faster the viscosity breaks down so a 15/40 breaks down a bit sooner than 20/50 and a 5/40 would breakdown pretty quickly.
 

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Your bike has a wet clutch, a heavy duty diesel most certainly does not.

I would dare to say that this is the primary reason why we are using motorcycle specific oils in our bikes, not plain motor oil.

Go get a proper oil with the correct additives for wet clutches and drain that heavy duty diesel oil asap.

That said... The rotella t probably won't damage your engine and should be safe to run but it is definitively causing your clutch issues.

Rotella T and T6 are both JASO MA rated.
 

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there is no way the clutch would slip under decel and not under load.

engine oils have not had any zinc in them for years now. the EPA mandated that they remove those additives from oils. to get zinc you need to buy break-in oil or racing formula oil.
 

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there is no way the clutch would slip under decel and not under load.

engine oils have not had any zinc in them for years now. the EPA mandated that they remove those additives from oils. to get zinc you need to buy break-in oil or racing formula oil.
Actually, motorcycles oils have around 1000 - 1200 zinc levels... Lots of automotive oils do too, diesel oil being one, as well as Valvoline VR1, just to name a few.

You're not going to find high levels of zinc in something like SN 5w30, 5w20 etc...
 

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Discussion Starter #10
i curious as to why you chose that particular oil or was it something you already had? either way it wouldn't cause clutch slippage. the more weight coverage an oil has the faster the viscosity breaks down so a 15/40 breaks down a bit sooner than 20/50 and a 5/40 would breakdown pretty quickly.

It's what they had in stock and I read it worked well for multiple people.


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Discussion Starter #11
Zero chance it's the Rotella. I've been running T6 in all my bikes for many years.

That's what I hear from a lot of people.I do get the fact that it's not meant for motorcycles though. I'm gonna pull it out and put in some synthetic motorcycle oil. Just so I know for sure I'm not crazy.

Seeing things like this really make me rethink my decision lol




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It's what they had in stock and I read it worked well for multiple people.


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if it works for ya it's all good if not switch until you find something that you like i tried 4 different brands before settling on amsoil 20/50 it is very expensive but i only change it once a year.
 

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Discussion Starter #18
I switched it and it seems normal now. Went with 10-40 Mobil 1 synthetic bike oil. Seems to be fine maybe I'm crazy lol.


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My opinion is based on a formal statement I received from Shell as well as results from several oil analyses from FZ1 forum members. What is Travis's opinion based on?
 
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