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YES, even it is a little bit of water, a new block costs for sure more than this seals.
Just imagine instead of oil you put a piece of butter in this gearbox.

I would not see this oilseals too tricky and expensive to change, since all are approachable from outside ( if it is this gear shown in pics)

this seal is inside. Outside is the bearing from what is saw so i need to open all the gearbox and i cant do it and it will be expensive work at the mechanic

This color indicates for ME somehow emulgation, water mixed with oil.
Let it sit for a day or two and look whether oil and water have separeted. If yes, water.
Then try to find out where it came from into your gear.
Might be an oilseal which let water in , or...

actually i had very minor oil leak around the rear wheel. Maybe its really the oil seal and when i washed my scooter some water got inside.. this is bad? Because replacing the seal its pretty expensive . I think its ok because transmission operation temperature are high so water will evaporate no? I just concerned about the transmission

I have castrol 80w90 gl5 oil and its days on the bottle 20/8/20 its Date of manufacture but i bought that bottle 1.5 year's ago.. can i still use it or buy new one?

DT 300I 15.4 or .5 gm .. I know this because I weighed them!
      350i  13.0 gm  ..  I will wait for Ruffus' confirmation!

You are entirely encouraged to experiment all you want because that is the nature of hot-rodding in most of England, USA and Australia to name three. Cosworth of England to name just one, the great Cosworth-Ford soup-ups that went into the Lotus-America thing I drove ONCE in about '63 and scared the ***P outta me! USA full of hot-rodders like Edelbrock, Hedmann, Mickey Thompson, Iskenderian who are a few who made business of manufacturing "speed goodies" for us greasers to spend money!

Burt Munroe from either Australia or New Zealand, the reclusive genius who cast his own pistons by carefully sculpting the female form in the ground near his shop!

You may be next!
I

i have downtown 350

This hole is supposed to be an indicator
 (by showing a drop ore more) that your rear axle/transmisson oilseal is worn out.
Means wheel off and renew. Axlebearings in your swingarm are to be checked too and if neccessary, changed.

to replace the oil seal is must to open the transmission bolts from inside?

9 gram? For a DT300i ? Should bee 15.5 gram for standard. 9 too light. Here is what you can get on ebay:

https://www.ebay.com/itm/142028986668?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=YL94YXbCRX2&sssrc=4429486&ssuid=xBSvxCaTSbO&var=&widget_ver=artemis&media=MORE

i have downtown 350i and i saw in kymco website that original rollers are 13 gram but i want more acceleration

I have kymco downtown 350i with 75000km i never changed the steering bearings and i have weird sound when i trying to turn the handlebar when its locked... Also i have clicking noise when i apply front brake. This is the video

I must to use locktight when i am changing my rotors? And where to apply this only on the rotors bolts? On also on the callipers? And i must use tourqe wrench?