Engine oil Castrol or PETRONAS

Absolutely always use mazda filter and the owners manual says use Castrol which the three local Mazda dealers use this I also go with it. Over 60k miles with oil changes anywhere between 3k-6k and still runs great.

I use Castrol GTX 20W-50, same as what the manual calls for. I know the oils changed since then but the previous owner didn't care for the car properly so I feel like the detergents are necessary.

Everything I've found for my 2008 Rabbit 2.5L engine specifies Euro 5W/40. Although you can find it in several brands, the best price I've found is the Castrol Edge Euro 5W/40 at Walmart for the 5-quart jug.

My giulietta 1.4 MA is still reliable at 130k km. Never had any problems with engine always used recommended petronas oil. Had to rebuild my turbo once (at 120k km) it had very little play that made my car burn some oil.

FWIW: I live in Maryland and use Castrol Syntec 5w-40 in my 2012 JSW 2.5. I usually buy the filter and plug/washer from the dealer because they have the best price and I don't have to wait or pay for shipping.

I use castrol in my 2014 cx5.

I use Castrol Edge European Formula 0W40 for all of my VWs (2005 Phaeton, 2014 CC 3.6, 2017 Jetta SE and now a brand new 2019 Alltrack SE): I buy it from Amazon, for $ 24.47 for 5 qts. The oil has a "European Formula" label on the front and specifically states "VW 505. 00 and 502. 00 " on the back, and is made in Brussels, Belgium.

I got some Castrol Edge Titanium FST 0W40 which is VW502 00 approved. I decided to try this oil as their name is on the oil filler cap, as in the past with other cars I always used Mobil 1 0W40.

Castrol Edge European formula 5W-30. Closest thing to group IV you can easily find in the states.

Not certain what Castrol makes for a synthetic, but I know I experienced white foamy build up on my oil cap on a previous vehicle using Castrol. Switched oil and it stopped.