Im not sure about the Eng.D

My personal experience of PhD in Engineering is... probably not worth it, but it depends.

This is why I think it's not worth it.

1. Time wasted. Experience worth more in engineering. Unless you want to become professor.
2. Money wasted. If you have GRA, it will be good, but those investment won't give better salary in my opinion. Not much benefit you got from your PhD.
3. Overqualified. Unless you have a job already. Else, if you study full time and then find a job, hard already. Nobody wants to pay you for something Master/B.Eng can do.
4. Lecturer position is hard to obtain. Teaching experience and good publication records required, not industrial experience.

However, if you can manage to skip Master, straight away go to PhD with GRA enough to cover your living expenses, and you can finish that PhD within 3 years, and you can secure a lecturer job with at least 5k salary, Yes, that PhD is worth it.

What engineering?

Based on my current experience, PhD is not for industrial practitioners. If you want to study PhD, the academic route should be your ultimate career. PhD explores the knowledge which the industry lacks knowledge on, which also means where the industry is currently not spending money on. Applying whatever you studied in the industry is usually not met with warm reception.

Also, it is generally not recommended to study PhD on a part-time basis. It'll take too long, it will distract you from getting fundings and sponsorships, and your budget will overblow due to inflationary pressure over the years, not to mention it'll be very physically and mentally taxing to do a 8-year (on average) part-time PhD while juggling with a full-time job.

But if you want to do it because you enjoy doing research, then go for it. But I'll still not recommend doing it on a part-time basis.

Need to verify this. If I am not mistaken, even if you want to study as a part-time in IPTA, you will still be registered as a full-time student.

Go ahead lah bro, I know you have done your research on the programme itself so dont stop yourself if you are able to. Never think is that worth or not just think you can or cannot.

Nope. For PhD studies, they allow you to take the part-time route. I did my PhD in UPSI (IPTA) and was registered as part-time.

*4. Lecturer position is hard to obtain. Teaching experience and good publication records required, not industrial experience.*

Actually not entirely true. It depends on the university - some IPTA even prefer a mix of academic qualification AND industry experience. IPTS we prefer having BOTH if possible. I speak from experience especially when hiring candidates.

For engineering especially, under EAC rules - each programme MUST have a certain number of Professional Engineers. If you have that together with your PhD - you are good to go. The only problem is whether your asking salary is too high for the university to pay.

What is your motivation for doing PhD? Is it for the sheer challenge of it or to open opportunities in academia one day.

Either way, if you have the time, money and motivation to do so - go for it. However, it is a VERY long journey and you are expected to keep your focus on the research at all times. Find a good supervisor rather than a good university. That will make your life easier.

Btw - in PhD, there is not really an academic experience per se. It's more of a learning, knowledge and research journey between you and your supervisor. It might be a real lonely path as you do not have classes nor classmates in that sense.

Depends on unis then. I know for certain that one of the IPTA will still register you as full-time.

Do you think is it worth to pursue Doctor of Engineering/Engineering Doctorate (EngD)/Industrial PhD in this case?

It really depends. If you want to keep the option open one day for a career in academia - then go for PhD. I am not sure about EngD or Doctor by Practice in Engineering btw. Maybe someone more well-versed in this area can assist.

However, the danger with Industrial Doctoral Degrees is that once you are no longer with the certain company, there could be some risks in the research continuity. If it is the same thing as DBa, then not an issue as it is not tied to an organization.

From MQA Standards - Master's and Doctotal Degrees 2021.
Industrial PhDs are, by and large, research degrees where the industry partners i.e., employers or a consortium of employers co-determine the objects of the doctoral study which are typically applied in nature.

'Expected' duration to graduate, see explanation by ike.tan below too. I did not check on if there is any difference in tutition fees per sem.
You are right, there is no maximum stated. Just a vague normal duration referred to as GOT (Graduate On Time)

Ah - Maximum duration is prescribed by HEP not MQA.

why the need for Engineering PhD? You want to become an academician is it?

If you are in the education line... then yes... give you a higher chance to be associate professor or professor in the future...

If you are in every other line then no.... it doesn't help SHIT.... you are better off getting CEng title..

Go for it if it is for your interest, but be careful if you can cope with it whilst working full-time.  I actually read for a part-time PHD out of interest at Malaya University some years ago, but have to give up after a year as I was too busy at work to cope with the research required for it.