Question about oil changes.

They both taste vile!

[SVGrandad]

Many years ago when working on hydraulic systems and looking at fitration levels, I found the comment that a used filter was better than a new one because it would stop more contaminant. A new filter had more empty holes in it and would therefore pass more until it had started to block up.
Not really relevant to bikes, but it does imply that changing a filter at too short an interval is not always good practice, particularly as you always add some contaminant to an oil system when you open it up.

[punyXpress]

Originally Posted by Zen Beetle

This appears to be a thorny issue. A google search is littered with those who are adamant that fully synthetic oil is too slippery and can cause clutch slip and those who think its ********. What makes the issue particularly perplexing is that there are very knowledgeable opinions on both sides.

Just like global warming, then ?
As B.Biggles says, fully synthetic can cost double semi.

Originally Posted by punyXpress

Just like global warming, then ?
As B.Biggles says, fully synthetic can cost double semi.

An intersting note; I went on the castrol website, just looking at oils and stuff. I use their semi-synth oil, and very good it is too. I tried their "let us tell you what oil to use" thingy, and it said I should use the fully synth oil

But i wont, because I dont want to risk clutch slip

[fizzwheel]

Originally Posted by alpinestarhero

But i wont, because I dont want to risk clutch slip

Eyh... how on earth is putting fully synth in your bike going to make the clutch slip... you've lost me on that one.

Edit : I read the post above yours, still sounds like cobblers to me...

[Dave20046]

Originally Posted by fizzwheel

Eyh... how on earth is putting fully synth in your bike going to make the clutch slip... you've lost me on that one.

lol I just thought it was more slippery!

Nothing to lose really alpineman (part from a few quid if it doesn't like it and you haven't another bike the oil could go in)

[yorkie_chris]

An oil conforming to JASO MA is tested for use with wet clutches. So that's pretty much all bike oils.

I've always used fully synth, and my clutch has never slipped. From miles under the wheels I conclude that the pub "experts" don't know what they're on about.

OTOH, if you use a totally different spec of oil to that specified then you have no grounds to whinge when it doesn't work as specified.

Originally Posted by fizzwheel

Eyh... how on earth is putting fully synth in your bike going to make the clutch slip... you've lost me on that one.

Edit : I read the post above yours, still sounds like cobblers to me...

fizz, im only going on what some other people have experianced. I don't wanna spend time and money stickin in full synth, only to find im getting worse performance.

Anyway, I'm sure it would be ok and its worth knowing incase halfords dont stock my prefered semi-synth

[Dave20046]

Originally Posted by alpinestarhero

fizz, im only going on what some other people have experianced. I don't wanna spend time and money stickin in full synth, only to find im getting worse performance.

Anyway, I'm sure it would be ok and its worth knowing incase halfords dont stock my prefered semi-synth

What are you buying from halfords? I always assumed they'd be stupidly expensive. I get putoline semi synth 4litres for about £16 IIRC.

Originally Posted by Dave20046

What are you buying from halfords? I always assumed they'd be stupidly expensive. I get putoline semi synth 4litres for about £16 IIRC.

Castrol something or another, i cant quite remember. I use my dads trade card and get 15% off