front and rear parking sensors you need to change as they wont work anymore
OCH is 40k kms or 2 yrs
Depends on your budget, there is different level of best based on how much you willing to spend

Best in terms of what? But the easy choice is usually Michelin Pilot Sport 4, 215/45R17
Prolong life of turbo, use good fully synthetic engine oil as it lubricates the Turbo's bearing system and takes heat away from it. Lower quality engine oil can result in oil coking when they are exposed to higher temperatures like in a Turbo. This is usually the reason for turbo failure since the oil can no longer flow properly, or at all

CVT gearbox, unfortunately even at stock spec, it's quite close to the 220nm limit of the gearbox. It should last as long as the driver's foot does not work like an ON-OFF switch, i.e. either a hard press or nothing. Be gentle when moving off from a standstill, halve the recommended service interval from Proton, and if budget permits, get better CVT oil like Rock Oil CVTF and a better CVTF cooler

For the parking sensors, I read that some Android head units are able to work with the parking sensors which communicate via CAN, which means they have a CAN controller/reader built-in. Perhaps the accessory shop or group can provide more info

my 4.5 yrs old Suprima S has had engine oils ranging from Syntium 3000 and Syntium 800 depending and mileage of 50+k kms, CVT fine, OCH fine basically replace on time with the correct oils is fine. Alot of OCH burst cases is due to didnt change on time, used additives which clogged up the cooler raising the pressure or using 3rd party hoses or silicon hoses.

CVT gear oil must be the right spec, not any CVT oil to ensure longevity and do not creep on traffic lights. Do not hard launch from stationary always.

Turbo doesnt need servicing if the right engine oil has always been used, it wont clog but can inspect the intake vanes for traces of oil

check the a/c belt condition also if high mileage or car above 5 yrs

Good to see some new owner. On the cvt Kong... Its sporadically reported and the funny thing is its not even from ppl with the mbox mod. Been driving it exceeding the spec for a while now and even dréx the one that coded it just uploaded a video of his silver preve going berserk with paddleshift. Don't worry about it, whether you baby it or not.. But don't full press from toll is a good advice though.

Hahah, I can't give a guarantee. But just as filter, if cvt Kong, preve and exora users who are way more than rimau will have a lot more complaint. And you don't really see it, or the user don't feel its troublesome enuf to complain about it openly. The only random ppl that come and go and say proton punch sucks... I don't think they even own a proton. Prosmac with all the old users, second hand owner everyday post belanja pic, I don't see complain car dying left right.
Just drive it with a bit of spirit... Its not a car meant for babying. Hit genting let the tire scream, see the traction control light up.