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Mineral Oil & Clutch Slip: Anyone used Castrol ACT EVO ??

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Tonto
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Mineral Oil & Clutch Slip: Anyone used Castrol ACT EVO

#1 PostAuthor: Tonto » Tue Jul 24, 2012 2:10 pm

Previous threads have mentioned semi synthetic oil and probable cause for clutch slip. My A4 was running on Castrol GTX with no probs; did an oil change 300 miles ago again using GTX, but this time she started slipping at between 4-5k. So at the weekend did yet another oil change: I used Castrol ACT EVO 10-40 Mineral: states on the marketing bumph "for use in Classic Bikes" - gobsmacked, but it actually fixed it: 100+ miles and no hint of clutch slip.
Not sure if anyone else had used it - but seems to have cured (one of) my A4's gremlins. :P :P

Cheers Tim
"Better to remain silent and be thought an idiot, than to open your mouth and remove any doubt" - Abraham Lincoln
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Eric Frith
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#2 PostAuthor: Eric Frith » Tue Jul 24, 2012 3:14 pm

Castrol changed the formula for GTX a while back, it used to be SG but not any more.

Silkolene do an SG semi synth for wet clutches, works a treat
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#3 PostAuthor: kz900B1 » Tue Jul 24, 2012 4:37 pm

Had the same issue with mine using GTX .Now running Rock oil 10-40 part synthetic and it appears ok.
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#4 PostAuthor: njwmct » Wed Jul 25, 2012 9:29 pm

Using Castrol Power 1 - 10/40w semi-synthetic (used to be Castrol GPS) in the MK2 with no clutch slip problems - designed for motorcycles that use the same oil for engine, clutch & gearbox.
I would think something like GTX (a basic car oil) is going to get broken down pretty quickly by the gearbox.
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#5 PostAuthor: 750steve » Thu Jul 26, 2012 7:05 am

Yup, GTX makes mine slip now too. Used to be JASO-MA rated now its not. Any JASO-MA rated oil will work in a wet clutch bike as it hasn't had friction modifiers added to it
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#6 PostAuthor: Pigford » Thu Jul 26, 2012 7:44 am

If an oil needs some extra "modifier" added to it - it can't be all that :??

Just make sure its motorcycle specific oil and it'll be fine :wink:
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#7 PostAuthor: IanM63 » Thu Jul 26, 2012 9:59 am

I used to know a crazy black guy with a 'Rat' CB200 who ran it on Mazola corn oil! :shock: :lol: Not sure if it's still running now though.. :boom
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