Hi. I need opinion? Is it ok to change mycar from ford fiesta 1.5 to preve manual or exec?

Is manual and exec preve underpower?  Tq

Depending on the oil that you used. If it's semi, then 5k interval la, although I heard people say that semi oil also can use for 10k

You can tell them that you want to use fully oil. If you let them just do what they want, then you have to follow what they say la lol

1. for fog lamp, use only HB4 or 9006 LED bulbs. I changed mine to 6000K very nice
2. havent tested but I will not favour it. Because it is like a normal LED bulb being cut into half (the CREE part) so the brightness will be reduced. However, for cosmetic purpose, should be fine lar.
3. 4500K is OK, it is as white as you can get. I'm using ultinon 6000K for main headlamps but its not blue, its pure white. In rain you cant "see" your white light as well as a yellow light, but its actually there. Test it in dark roads and you know what I mean. No problem for me so far, actually i find white light easier to see at night than yellow lights now. Most obvious is road signs and especially the road lines paint (what u call it?) will actually pop-up under white lights.
4. if china brands, the wattage they stated all cannot believe. They will claim 55W or even 100W but all not very bright. Use proper brands.
My 35W philips (main headlamp) is brighter than the claimed 55W of my china brand LED bulbs (in foglamps)

in case you curious, this is the original philips H7 LED bulb.
H7 Philips LED for headlamp

i bought from lazada if not wrong. no things needed. just plug out old bulb, then plug this one in (the instructions are given together with the bulb).
It comes with an LED driver unit, but its so small (sized like cigarette lighter) i just push it into the headlamp assembly and close everything up neatly with the standard rubber dust cap. Actually what i like most about this LED is it consume less power and there is no "sudden dim" dip when compressor kicks in.

Lazada no more stock. I found it on another website though.
Price same as what I bought. PM'ed to you a link.

hehe....dont forget share your exp once you've done it

Next DIY is DRL on preve. I read it up it's as simple as connecting the DRL connector (its already there, just not connected) to a power source, like fuel pump. The problem here is I'm too lazy to remove the headlamps (coz need remove front bumpers too)....

even if use the one proton is using, but iridium type will effect is it?
300 for all is it?
you major service for how many km?

im at 88k and still havent do major service 
need to do soon..
is it really the dashboard or the engine?
my case it's the engine cover loose.

Guys this can be fixed?

If ask workshop need charge how much?

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The bulb holder came off so easily while I wanted to change the bulb.

Any idea where to change the headlamp cheap? Thanks.

I will suggest you don't touch it or else end up same like me.