10w-40 or 10w-50

riichy · World Chat Champion Joined: 12 Apr 2005 Karma :

got somwe silkolene 10w-50, to do an oil change on my zxr400. i got 4l and havnt open it yet. the only thing is i read some past posted and it said 10w-50 fullysynthetic can corse clutch slipping. so should i take the oil back and get w10-40, or just stick the w10-50.. Question

thanks riichy Thumbs Up

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.......... PLOD ............ zx636 2004

dodsi · Dirty Carny Joined: 06 Aug 2004 Karma :

Take it back fully sealed and swop it for 10W40 Thumbs Up

riichy · World Chat Champion Joined: 12 Apr 2005 Karma :

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

10W50 should do the job fine. Only difference between a 10W40 and a 10W50 is that the 10W50 works better over a bigger temperature range.

riichy · World Chat Champion Joined: 12 Apr 2005 Karma :

dam you guys are both saying diffrent things "what do i do" Confused

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.......... PLOD ............ zx636 2004

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

its the fully synth part that may make the clutch slip.

My TT600 is supposed to run on 15w50, and I'm surprised that you can easily get 10w50...
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mr.z · World Chat Champion Joined: 04 Feb 2004 Karma :

If its labeled as "car oil" then it will probably have friction inhibitors.. additives that will feck up your clutch good and propper...

If its got a little picture of a bike (or you got it from a bike shop) then you should be ok..

If you got it from a car shop take it back, open the top and throw it in their stupid faces!
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riichy · World Chat Champion Joined: 12 Apr 2005 Karma :

i got it from a bike shop. on the front it has a bike and 4t it from bikes. its just that some people say fully sinth can make the clutch slip on 400cc so i want to make sure be for i open it Thumbs Up

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.......... PLOD ............ zx636 2004

Knowlsey · Scooby Slapper Joined: 07 Apr 2005 Karma :

riichy · World Chat Champion Joined: 12 Apr 2005 Karma :

Knowlsey thanks fella

i think am going to take it back tomorrow. Thumbs Up

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.......... PLOD ............ zx636 2004

mchaggis · World Chat Champion Joined: 10 May 2004 Karma :

What type of oil is the 10W40 which is in it just now? If it is semi-synth, stick with semi-synth. If it is fully synthetic, then bung in the 10W50 and be secure in the knowledge that it will make bugger all noticeable difference.
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Chriss · World Chat Champion Joined: 07 May 2005 Karma :

I run funny synth oil and I have no problems. Thinking

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Mungel · Scooby Slapper Joined: 21 Apr 2005 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

If it is fully synthetic bike oil then the clutch is almost certain to be fine with it. If it is fully synthetic car oil then the clutch will probably be fine. If it is Silkolene then I would be surprised if it is car oil (not sure they sell any).

I have used fully synthetic car oil in bikes loads of times without any clutch problems. Others have had problems. Seems to depend on the exact brand / spec of oil you use.

Biggest advantage of synthetic oils is that they have less additives, and it is the additives that get get broken down and wear out (the actual oil barely degrades).

All the best

Keith
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