Castrol Semi Synth vs. AMSOIL - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 21 (permalink) Old 05-02-2011, 04:04 PM Thread Starter
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Question Castrol Semi Synth vs. AMSOIL

Hey gang,
I am about to have my first oil change since I bought my RC. I have gotten a bunch of conflicting emails and data on this subject and needs a bit of sorting out.

Which will be better for me, the Castrol Semi Synth or AMSOIL ? I have ruled out Royal Purple after viewing previous threads as well as some online reading.

It is my understanding that Mobil 1 is not as good in Twins as is the Castrol or AMSOIL

Any and all help is greatly appreciated !!
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post #2 of 21 (permalink) Old 05-02-2011, 04:47 PM
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I use Amsoil, but I can't say wether or not it's any better than castrol Semi Sythetic or not.

I have run Amsoil for years in my sportbikes, and dirtbikes. Never any signs of wear that were associated to the break down of the oil, or it's limits. I also change my oil religiously, so I'm sure I throw a lot of good oil into the recycling too.

You'll have to wait till maybe someone else tunes in. I think at the level of oil your looking at, it may just be preference.

I do however only use OEM filters as a rule. I often open up my filters during oil changes for inspections and have never seen any issues relating to the condition of the filtration screens on an OEM filter. I have seen other filters on other peoples bike almost come apart on inspection, which only concerns me as to what made it into the engine.

And at any rate, my dealership always keeps the OEM filters in stock, and the price is no worse than any of the aftermarket brands.
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post #3 of 21 (permalink) Old 05-02-2011, 07:34 PM
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Originally Posted by raleighp View Post
Hey gang,
I am about to have my first oil change since I bought my RC. I have gotten a bunch of conflicting emails and data on this subject and needs a bit of sorting out.

Which will be better for me, the Castrol Semi Synth or AMSOIL ? I have ruled out Royal Purple after viewing previous threads as well as some online reading.

It is my understanding that Mobil 1 is not as good in Twins as is the Castrol or AMSOIL

Any and all help is greatly appreciated !!
Read a motorcycle oil comparison test a few years ago, and while Amsoil rated #1, Mobil-1 4T was a close 2nd.
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post #4 of 21 (permalink) Old 05-03-2011, 08:46 AM Thread Starter
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Thanks guy's...I appreciate the help. The mechanic that I bought my bike from swears by Castrol as he runs it in all of his bikes and I suspect that is what is in mine now. The shop close to my house swears by Amsoil, so that lead to my confusion.

Thanks again !
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post #5 of 21 (permalink) Old 05-03-2011, 05:24 PM
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How much can your wallet stand??

I buy the Castrol full synthetic...no issues.

I used Mobile but the Castrol is more available in my area.



The very first schoolbook that was written had God all over it. --Dave Mustaine
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post #6 of 21 (permalink) Old 05-04-2011, 06:50 AM
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I use castrol 4t, never had an issue. seems like its pure preference..

2003 ZZR1200 - Galfer Lines, EBC HH Pads, Corbin Beetle Bags and Seat, Genmar Risers, Muzzy Full System. - Street.

2007 RSV1000R - Penske triple clicker, Ohlins forks, Ohlins steering damper, Leo Vince titanium full system, race ECU, Brembo mono-blocks, Braided lines, Race battery, etc.. - Track whore.

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post #7 of 21 (permalink) Old 05-05-2011, 01:43 AM
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Always went with Amsoil for this bike, but i honestly have not heard anything bad about Castrol or mobil

As far as wear goes, as long as you do regular oil changes you will be fie with any of the above brands.

As far as the transmission goes, i've never had it slip, had a hard shift, or been locked out of Neutral while using Amsoil(getting into Neutral on some other bikes can be a nightmare, and the different oils actually have a huge noticeable difference, aprilia is one of those.)

2001 Honda RC51 SP1
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post #8 of 21 (permalink) Old 05-05-2011, 07:53 PM
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Castrol doesn't refine their own oil. They buy it from one or more of the big guys and private label it.

I just changed my oil to Honda HP4S 10-30w. They want 14 buck a quart, but I didn't have to pay anywhere near that. If I had to, I would opt for Mobil 1, I can get it for 9.99 @ auto zone.

btw, my bike shift better and smoother than it ever has in the short 3 months I been riding it. Love the way it feels.

John, 2000 RC51 #000100

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post #9 of 21 (permalink) Old 05-06-2011, 10:22 AM Thread Starter
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Thanks.....think I will go with the AMSOIL this time. For a difference of about $20 I figure what's the harm...also, what is the general feeling on OEM vs. K&N Gold filters

Last edited by raleighp; 05-06-2011 at 10:49 AM.
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post #10 of 21 (permalink) Old 05-06-2011, 01:01 PM
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From I've gathered, some bikes respond to K&Ns (or similar), others don't.
For the RC51, it's said it doesn't respond well with K&Ns over OEM.
I figured what the hell and ordered OEM this go around.
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