Which oil for smoothest gearbox?

[Speedy1959]

http://www.supercheapauto.com.au/Product/Penrite-Full-Synthetic-Engine-Oil-10W-40-6-Litre/348769

This is the Penrith one I have been using, which is recommended for 4 stroke wet clutch motorcycles.
Don't pay extra for Penrith so called specialty Motorcycle oils which are worse.

Andre, what do the specs on this look like to you ?

@Speedy1959 Here you got a light duty diesel engine oil for your 14.

Leads me to rethink my aversion to diesel engine oils 

Andre..
For Diesel cars I have always been a big fan of Millers Oils..
Here is the link for both semi synthetic and fully synthetic..
See what you think of the specs..

Semi- synthetic 10W-40:

https://www.millersoils-shop.co.uk/xfe-10w40-engine-oil

Fully Synthetic 5W-50:

https://www.millersoils-shop.co.uk/xf-longlife-5w50-engine-oil

[Andre]

@Speedy1959
The 5W-40 falls out of the recommendation for the 14 by Suzuki. Lowest W recommended is 10! 5W may be suitable if you ride in lower than minus 20 degree celsius.

Millers states that the XFE 10w40 "Will allow fuel economy and engine performance to be maximised". I wouldn't use this one as it indicates that it contains a lot of friction modifiers - not a good thing for wet clutches!

My prvious bike the MT-01 slipped its clutches when I used fully synthetic oil.

Did you change from mineral to synthetic? Mineral tends to deposit sludge, however in non-critical areas. When you change to synthetic it will loosen the sludge deposits. When these get into your clutch it will slip. Synthetic oil by itself does not cause clutch slippage unless it has to many anti-friction additives in it.

[Speedy1959]

Hi Andre,

No I havent changed to fully synthetic yet..
I can tell you though (as I mentioned) the Motul 5100 is being drained within the next week!
I am seriously considering the Halfords semi synthetic stuff.

I used to have a BMW GS1200..
The local car accessory shop suggested I try the Comma semi synthetic.. (The bike shop was closed as it was a Sunday)..
I thought "what the hell" and tried it... I could not believe how silky smooth the engine ran on it. It wasnt even bike oil but the BMW engine loved it.

Now I know that is a pretty old design of engine and pretty agricultural.
But yet again it shows how different oils DO have different properties and DO affect how well an engine runs..

[gsxbarmy]

Personally I preferred the Silkolene Comp-4 semi synthetic to Halfords, but it was purely my preference rather than necessarily better, both good oils.

@Speedy1959 be careful if you choose to swap to a full synthetic. Whatever specs and the suchlike may say, not so much on here, but on the old org, a few who swapped over subsequent had to replace their clutch plates as changing to synthetic made the clutch slip. Only happened to a few owners, others had no issues at all, but just so you are aware.

[grog]

most oils are good, some not just as good. i tried the comp 4, as i said 4 litre container a pain. whatever suits you is the go, if it meets specs. gear change better with penrite semi and better again with gulf western. motul worst i tried and also worst chain lube. just my opinion but have no probs with synnex 3000. maybe buying it impossible in nthn hemisphere. i think a couple of aussies switched to gulf, havent heard any reports. was a fair while ago. i like clean oil, so cost of ryco filter $10, oil around 20, every 3 to 4 k change makes me happy.

[Hooli]

Hi Andre,

No I havent changed to fully synthetic yet..
I can tell you though (as I mentioned) the Motul 5100 is being drained within the next week!
I am seriously considering the Halfords semi synthetic stuff.

I used to have a BMW GS1200..
The local car accessory shop suggested I try the Comma semi synthetic.. (The bike shop was closed as it was a Sunday)..
I thought "what the hell" and tried it... I could not believe how silky smooth the engine ran on it. It wasnt even bike oil but the BMW engine loved it.

Now I know that is a pretty old design of engine and pretty agricultural.
But yet again it shows how different oils DO have different properties and DO affect how well an engine runs..

Don't those BMW GS' have a dry clutch? so unlikely to get the normal bike problems of running the wrong oil.

[Speedy1959]

Yes Hooli they do indeed have a dry clutch.
And they are a nightmare to put a new clutch into..
Its a truly MASSIVE job which BMW will charge up to £1000 to do !!!

[Hooli]

Aye I've heard they split the bike in two to get to it. I think Goldwings are the same & maybe Pans.

[Kiwifruit]

I've been running that Gulf Western Synnex 3000 for a while now. Got a 5L pack and new filter yesterday. I like it. 

[Mick_J]

Hi Andre,

No I havent changed to fully synthetic yet..
I can tell you though (as I mentioned) the Motul 5100 is being drained within the next week!
I am seriously considering the Halfords semi synthetic stuff.

I used to have a BMW GS1200..
The local car accessory shop suggested I try the Comma semi synthetic.. (The bike shop was closed as it was a Sunday)..
I thought "what the hell" and tried it... I could not believe how silky smooth the engine ran on it. It wasnt even bike oil but the BMW engine loved it.

Now I know that is a pretty old design of engine and pretty agricultural.
But yet again it shows how different oils DO have different properties and DO affect how well an engine runs..

Don't those BMW GS' have a dry clutch? so unlikely to get the normal bike problems of running the wrong oil.

Not any more, combined and wet like everyone else (sept some ducati's).