What engine/gearbox oil should i use

[Lipsmoker]

Okay so my bike is a Rieju mrx 125.. with a Suspected 125 CCM engine.. basically not a standard Rieju engine

Project here https://www.bikechatforums.com/viewtopic.php?t=220980&start=0

And it's due an oil change..
Obviously it shares it's engine and gearbox oil being a 4 stroke Single but i am unsure what Grade oil to use and how much..
Filling it up can i just go by the dipstick? and do i measure whilst it's on the sidestand or with the bike level

Obviously i drain the oil when it's warm

I have looked on eBay and according to several sites i Should use 10w 40 like this.
https://www.ebay.co.uk/itm/SILKOLENE-COMP-4-10W-40-4-STROKE-ENGINE-OIL-1L-LITRE-/270714379345?pt=UK_Motorcycle_Parts&hash=item3f07d59c51

Is this right?
thankyou.
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Four wheels move the body. Two wheels move the soul.

[hmmmnz]

the cheapest hafords oil you can find,
the uk barely gets cold enough to warrant a 10w oil
cheap 20w50 will be fine
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the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[temeluchus]

wilkinson etc sell 15w40 which will the trick.
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Some shite cruiser. Now with guns and FREEDOM!

[Kickstart]

10W40 is a good guess, although as mentioned the UK is pretty mild so you have other choices.

[P.]

As its not pumping out immense power and is a basic engine, 10w40 from Morrisons will be fine. I reckon you'll get anything between 900ml and 1litre in the bike, but could be less

Morrisons oil is like £4