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PostPosted: Mon Feb 22, 2016 7:16 pm 
Still in the Driveway

Joined: Sun Sep 23, 2012 6:39 pm
Posts: 6
Country: USA
Bikes owned: T500
During my road racing years, I frequently used Castrol R (castor bean oil). It seemed to work well, but required throwing away pre-mix if it wasn't to be used within a couple of days and would drop out of suspension when the weather got cold. I recently got a quantity of Silkolene castor/synthetic oil and would like to use it for my return to the drag strip. Is this stuff any better than traditional bean oil and have a longer shelf life when mixed with racing gas? If you have some experience with this product, I'd like to hear from you.

PostPosted: Tue Feb 23, 2016 10:53 am 
AMA Superbike
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Joined: Tue Oct 14, 2008 6:47 pm
Posts: 1725
Location: Blythewood, SC, USA
To tell the truth, I have never heard of the Silkolene product. The castor-based oils have pretty-much disappeared. I have no idea, but thought someone should respond. Sorry.....


If you stroke it more than twice; you're playing with it.

Too many bikes, too much time, ENOUGH SPACE, FINALLY! Never enough money.........

PostPosted: Wed Mar 23, 2016 7:58 am 
Moto GP
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Joined: Mon Nov 03, 2008 10:47 am
Posts: 6025
Location: Illinois
Silkolene oils made by Fuchs - excellent oils. Used to use it all the time in our RS250 Cup bikes. Got it from in Texas. Great people.

Castor is still the highest lubricity oil.

Suzuki cranks not well suited to pre-mix even if slingers and main bearings are modified, but they can last 13 seconds or so.

Castor based oils tend to leave a sticky residue if left for any significant time. Not sure how much modern blends oxidize but it used to be a problem. I need to research that again.

Pre-mix of any sort goes off pretty quickly. Fuel loses its top ends (lighter fractions) and oil separates out. Best to use a small tank and mix only enough for the run/day. At the end of the weekend, drain all race gas and throw it in a can to be used in a farm truck, weedwacker or street (dirt) bike if you do enough street miles and flush it through after use.


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