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chris-red
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PostPosted: 13:43 - 17 Jan 2017    Post subject: If something specifies 10w30... Reply with quote

What is closer/better to use 5w30 or 10w40.

In b4 use 10w30, I can get 5w30 or 10w40 for nothing.

It's for RXS forks and gearbox.
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Suntan Sid
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PostPosted: 13:52 - 17 Jan 2017    Post subject: Reply with quote

I started with 10W in my XL125 forks, they felt really stiff, for a trail bike, I finally went with 2.5W for the forks, they're great now, for a trail bike!
If it was my bike, I'd try the 5W for the forks and the 10W/40 for the gearbox!
How old is the bike?
Mine is old enough that the oil specified for the forks was automatic transmission fluid!
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chris-red
Have you considered a TDM?



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PostPosted: 13:58 - 17 Jan 2017    Post subject: Reply with quote

Suntan Sid wrote:
I started with 10W in my XL125 forks, they felt really stiff, for a trail bike, I finally went with 2.5W for the forks, they're great now, for a trail bike!
If it was my bike, I'd try the 5W for the forks and the 10W/40 for the gearbox!
How old is the bike?
Mine is old enough that the oil specified for the forks was automatic transmission fluid!


It's an 88, it's a road bike so I'll see it goes stiffer forks may not be a bad thing.
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Rogerborg
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PostPosted: 14:28 - 17 Jan 2017    Post subject: Reply with quote

Suntan Sid wrote:
Mine is old enough that the oil specified for the forks was automatic transmission fluid!

That's not unusual, it's still commonly recommended for modern Enfie - oh, I see your point.

I did 10W40 mine though, because much cheapness, many bargains.
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Pete.
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PostPosted: 17:27 - 17 Jan 2017    Post subject: Reply with quote

For the gearbox I'd go heavier grade over lighter. For the forks I'd just put something in, fork oil never seems to stay healthy for long.
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stinkwheel
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PostPosted: 18:59 - 17 Jan 2017    Post subject: Reply with quote

ATF will probably do better in forks than engine oil anyway.

It's designed to take a total hammering in an auto gearbox and will be low froth.

So in answer to your question... I'd put ATF in there. I have it in my VFR750 and my enfield.
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Rogerborg
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PostPosted: 19:26 - 17 Jan 2017    Post subject: Reply with quote

Agreed, the only reason I didn't use ATF in my forks is that I'd already squirted my full load into my primary drive.
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weasley
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PostPosted: 20:28 - 17 Jan 2017    Post subject: Reply with quote

The answer to the question asked is the 5W-30, which will be close to the 10W-30 when hot and will flow better when cold. Being a 5W-30 will also tend to mean it is a generally better oil too, with better base oils.

The unasked questions have been well answered above.
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Kickstart
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PostPosted: 21:13 - 17 Jan 2017    Post subject: Reply with quote

Hi

For an engine I would go for 5W30.

For the forks I would probably go for the 10W40, making an assumption that the fork oil won't increase in temperature by anything like as much, and 10 weight oil is standard.

All the best

Katy
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Pigeon
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PostPosted: 00:19 - 18 Jan 2017    Post subject: Reply with quote

Kickstart wrote:

For the forks I would probably go for the 10W40, making an assumption that the fork oil won't increase in temperature by anything like as much, and 10 weight oil is standard.




Weasley is BCF's oil guru, but as usual I'll throw my incorrect 2p in Smile


Kinematic viscosity of Oils (cSt@40c):

Motul Expert Fork Oil 5w = 18
Motul Expert Fork Oil 10w = 36
Motul Expert Fork Oil 15w = 57

Castrol Edge Engine Oil 0w20 = 47
Castrol Edge Engine Oil 5w30 = 66
Castrol Power Engine Oil 10w40 = 66

So the closest engine oil to a 10w fork oil is 0w20 in the above examples.

I shoved a blend of fork oil and 10w40 engine oil in my SV's forks to make up 50cSt@40c and by luck rather than judgement, it worked really well Smile
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weasley
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PostPosted: 09:15 - 18 Jan 2017    Post subject: Reply with quote

Pigeon wrote:
Kickstart wrote:

For the forks I would probably go for the 10W40, making an assumption that the fork oil won't increase in temperature by anything like as much, and 10 weight oil is standard.




Weasley is BCF's oil guru, but as usual I'll throw my incorrect 2p in Smile


Kinematic viscosity of Oils (cSt@40c):

Motul Expert Fork Oil 5w = 18
Motul Expert Fork Oil 10w = 36
Motul Expert Fork Oil 15w = 57

Castrol Edge Engine Oil 0w20 = 47
Castrol Edge Engine Oil 5w30 = 66
Castrol Power Engine Oil 10w40 = 66

So the closest engine oil to a 10w fork oil is 0w20 in the above examples.

I shoved a blend of fork oil and 10w40 engine oil in my SV's forks to make up 50cSt@40c and by luck rather than judgement, it worked really well Smile


That's as good an answer as any; 40°C is pertinent to fork oil, which is essentially acting as a hydraulic fluid and hydraulic fluids are generally specified at 40°C rather than the 100°C used for engine oils.

I've just looked up a common-or-garden ATF which has a KV@40°C of 33 cSt.
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