Which Oil?

Can anyone tell me what difference it would make to my bike (88 GPX750R) if I used a different oil?

At the moment the mechanic put standard mineral based oil in it. If I was to go to semi-synthetic or synthetic would it make it run any smoother or would it run worse?

Probly won't make much difference if you change it regularly, but personally, I'd run a semi synthetic as a minimum. Mainly as its a better quality oil, will lube a little better and there isn't much price difference with some of the cheaper ones.
Supercheap have some shell semi for $44 atm, when the 20% of sale was on it $35.20..

I use Castrol R full synthetic which is $48 when on sale at supercheap (I stock up)...

Which brand of oil is a whole big can of worms. Supercheap do some great deals on a variety of oils, it's where to go. I use Silkolene Semi synthetic. I've always used Silkolene and have never had issues, and Semi synth as most bikes have a wet clutch and some synthetic oils are too slippery and you get clutch slip.

It's a personal thing in the end, but I'd never go back to mineral oil in any bike.

Thanks guys

I think I will give the semi synthetic a go and see how it runs.

Thanks guys

I think I will give the semi synthetic a go and see how it runs.

as a past GeePeeX750r user...thats fine
but you may find that the ol'girl doesn't like certain brands

mine would HATE anything Shell ..and tell you with a box full of neutrals
and a rattle on startup. Most car engine oils gave me a similar result
...a baulky gearbox and so i settled on better bike oils like
...Motul or Silkolene..the GeePeeX was a nice bike to ride then

hth

Smitty

Thanks Smitty

The mechanic actually put Shell in it last time they serviced it so I will try a different brand and see how she goes

oooh .. thanks for this post

Was just considering the same thing for my old girl ...

Just make a note of the Gear shift, Try a few different ones & types untill you find what the box likes the most.

Tiggr 02 9r would false nuetral like a SOB 3rd-4th with fully synth, went back to semi 7 it was business as usual.

I'm a Fuchs silkolene man myself, mainly because of a recommendation from someones opinion i value & i can get it at the right price.

I run Shell Advance full synth in my C1 ZX9 gearbox works nicely with it, if I get any crappy shifts it's normally when I'm about due for an oil change. I have had no clutch slip with it either.