Engine oil Castrol or OEM Mazda

Castro Synth. is all i ever used in my BMW 60,000miles runs perfect change every 7,000 miles

(5w-40)

After some research I heard people use 5w40 to quiet the motor down and lubricate the lifters better for high mileage engines. picked up some castrol edge 5w-40 and it runs buttery smooth, noticeably quieter and another big thing is oil consumption drops A LOT due to the oil being thicker and harder to burn or leak. I used to need maybe a quart a month now Ik down to half a quart a month.

I use this Castrol Edge 5w40 for 5 years already in my e46’s m54b30. No issues. Trying to stick to 10k km intervals.

In my e39 M54B30 473k km I am dumping Castrol Magnatec 5w-40.

Nothing to complain.

I run 5w-40 in everything. Mazda Skyactiv, Toyota 3UR, Honda J35. They all like it and run quiet.

I use castrol 5w-40 Euro on my 2006 Revup. Good oil pressure on hot SoCal days and burns less oil.

I have an MX-5 with that engine, Mazda uses Castrol Edge 0w20 but you can use a heavier oil and sime say it reduces wear. The purpose of the 20 weight is fuel economy.

I live in Turkey vw service uses Castrol EDGE 5W-30 LL

So, the cause for VANOS to work as shit was an oil. I put Motul and engine drunk it like it was a water. After oil change to Castrol magnatec, engine works like a charm.

For the record, this is NOT the exact replacement to Mazda 0W-20 GF-5 with Moly - Synthetic Engine Oil.

While this has high molybdenum, it's still a different formula from Mazda's own proprietary blend.