Engine oil OEM Toyota or Mannol

First 500-1000 miles is probably a good idea since there are likely metal bits left over from the manufacturing process and, although they get cleaned very well, the oil does a much better job of it and you don't want those bits floating around in yiur oil or in your engine itself.

After that, you can change your oil as often as you want as long as its under ~10k miles. Most people recommend 5k miles bc oil will pick up debris and metal shaving and what not and 10k is a bit long to let it go unless you're using a much higher quality filter like amsoil or Mobil 1. Most full synthetic oils will last longer than 10k miles these days, but I wouldn't push it due to the debris it picks up.

I got my first oil change at 1065 miles following Toyota Master Diagnostic Technician youtube personality The Car Care Nut's advice to do the first one at 1000 miles, and will follow a 5000 mile / 6 month schedule going forwards.

OP I have the same car and engine as you, I've been using the cheap Mannol stuff, whichever is cheapest. Also whichever the cheapest oil filter is from ECP at the time. Car is currently on 120k and I've been doing this for at least 5 years and it hasn't eaten itself yet!

You can actually get decent quality oil which is not from an expensive brand for pretty cheap, particularly if you buy a 20l jug.

For example, Mannol offer fully synthetic oils which meet OEM specifications

We haven\u2019t done anything but oil changes since buying it.

Been using Mannol 5w30 Full Synthetic for past 35k miles now without any issues.

For the UK, cheap and good: Mannol Fully Bi-Synthetic Engine Oil Longlife 3 5w30

The car runs well, no problems starting up, no significant oil burning.

I use Mannol 7715 on my 3.0tdi

Personally I use 5w-30 because it's the cheapest. I've used 0w-20 and 0w-30 in the car also. Can't tell what is in the car at any given time as it runs exactly the same regardless so just use the cheapest that's still up to the relevant specifications.

I used Toyota OEM oil twice and was disappointed by the way it changed color at less than 5,000 kms. Two different mechanics asked me if I had delayed the oil change. Since then I started using Synthetic 0W-20 and never had any complaints.