Mechanic used thick oil

[svdb71]

I've done 1500km and no oil burnt so far. This stuff is thin as water, 0W20 is probably thinner than air!

One thing I have noticed is improved fuel economy. I'm now getting around 7L/100km vs 7.8L

 

[YZJB]

I haven't seen that oil in US, but I found its data sheet and looks a robust oil. It's VW 504 00/507 00 approved and exceed ACEA C3, which means it's not ACEA C3 certified, but that should be fine.
https://penriteoil.com.au/assets/pis_pdfs/ENVIRO+ 5W-30 (FULL SYN.).pdf

There are might be two reasons for the mechanic to use 10W40:
- the car burns oil
- because of the Australian climate

With the 5W30 you'll find out which of the two is. Run the oil for no more than 8000 km and check after 2500 km to see if the car burns any oil. Just make sure you run full synthetic oils.
Any of these will be fine 5W30, 10W30, 5W40, 0W40. Preferably on the back label of the oils should say ACEA C2 or C3 or A3/B4. Or any of these MB-Approval 229.31, MB-Approval 229.51, MB-Approval 229.52, BMW Longlife 04, Porsche C30, VW 504 00, VW 507 00.
Your oil already covers the bolded specifications, so the oil is a good stuff. This oil is much better than the one the mechanic was using, for sure.

Not quite. The oil the OP has posted and used is Penrite Enviro+ GF-S which is an ILSAC/API SP oil. Penrite has a whole range of Enviro+ oils, one of which has 504/507 approval, but GF-S is not that oil.

For reference, see here: https://penriteoil.com.au/products/brands/enviro+

 

[Japanese]

Penrite has a whole range of Enviro+ oils, one of which has 504/507 approval, but GF-S is not that oil.

You are right. I was looking at a different oil Enviro+ Petrol & Diesel.
This GF-S oil does not cover the specs I listed above, so please, disregard my previous post.

 

[Carlostrece]

You can run 0w20 or 5w20, no need for the 0W part in any oil where you are. I'd probably use either 5W30 or 5W40 synthetic oil in it. FTR there's nothing wrong with the 10W40 the mechanic who serviced it was using.

I'd use 5w30, or maybe 5w40, synthetic in a consistently hot climate.

 

[demarpaint]

I'd use 5w30, or maybe 5w40, synthetic in a consistently hot climate.

Mirrors what I said.