If the engine oil leak into clutch area and the clutch 'get wet' with the oil.
will this causing clutch slippery and finally causing it spoilt?

To replace the oil seal involve lot of work? need to take out the whole engine?
Thanks for answer me.

my workshop offer me to repair this problem for Myvi RM450. But myvi owner get it done at RM100 from elsewhere. Just change the flywheel oil seal

Yes, the engine oil would cause the clutch to slip.
When the clutch is seriously contaminated with oil, ur gearbox may not be able to engage (like clutch fully worn, but it's not).

To get to the fly wheel oil seal, the GB must be remove. Labour alone RM100-200 d.
So think back, when was the last time u changed clutch kit? If it's almost due, maybe u'd want to do them together.

Do you know where the myvi owner change it?

Well, my cefiro have this problem lately, the auto gb need longer time to engage, when move to d, in the early morning i need spend 2-3 minute to warm it up, and it getting worst lately. any problem on it, or any method to overcome? was informed by workshop that the gb need to change, it say it not in good condition. Do changed clutch kit can solve this problem? and how much the cost involved ?.Bbtw, for yrs infor, the gb hve been used for 250k km without much problem.

Auto GB got no replaceable clutch kit. But do check for any sort of leaks, be it engine oil or ATF.

For ur GB, is it after warming up, then whole day no issue?

If yes, I'd suspect it's either a contact issue and/or the oil pump (inside the GB) is starting to fail. Thus after u start the engine, it'd take a while for the ATF to circulate within the GB.

I have a Proton Saga 1.5I with similar issue. And the prob is around for like 2-3 yrs d. When it 1st started, it took like 1 min b4 the gears would engage. Now it'd need approx 3-5 mins each morning. I checked with a mech who's familiar with Jap car auto gb, he said can try changing the oil pump, but he can't guarantee everything would be perfect after that. So i decided to thrash the GB until it dies completely b4 changing.

Getting a used GB would cost RM2-3k while overhaul would cost RM3-4k for a Cefiro.

Thank bro scorgio for yrs reply.

At the moment, they are no leaking of engine oil or ATF oil after 3 rd time repaired.

The thing is that a year ago , my engine have serious oil leaking problem, send 3 times to workshop to rectify the problem, 2nd time change other oil seal part, until 3 rd time, change the fly wheel oil seal, it totally block the leaking problem, so it darg for a few mth to monitor and repair it. after the 3rd repair, the workshop told me my gb in bad condition, he suggest need to change with a recond unit.

The problem happen during morning or nite, which if stop a few hrs , the engine cool down, then this problem repeat, when go out for lunch, let say 15 min, it can work as normal.

I beem send the car to flush the ATF fluid inside the GB and change with whole new ATF after the flush, but the end result stil the same

It that difficult to change the oil pump for this car, the oil pump is mount nearby the engine?, i may try to source a recond oil pump fr chop shop to try my luck. i been ask the GB in some chop shop, they told me the whole engine c/w gb cost 1.8k only, so i guess the GB alone would be much cheaper, rite. Any advise on above matter?

Not the issue of ATF.

The oil pump is inside the GB. To get to it, need to remove GB, take it apart, then only can get to the GB oil pump.
The problem is, after changing oil pump, put everything back together, install back the GB, there's a risk that the gearbox may not be as smooth as b4. So usually ppl don't bother to do it, unless overhaul GB which most of the wear & tear parts inside are replaced.

If the GB is bothering u, suggest u get a replacement from halfcut. Don't take recond.

Sorry, long time not see the development here

Last 1-2 week, due to longer time need to wait for the gear to engage, so press the paddle to level 2, but suprisingly the car was move, but need run it slowly around few minute, then push back to level D, then the gear can function normally.

Any comment on the GB which have this problem, is really time up to change the GB? Does the above practice will accelerate the damage of GB? Form yrs point of view, how long the GB will "gong"?.