Engine oil Castrol or OEM Mazda

Castrol Edge. My car is very specific about what grade the oil has to be and this seems to be the only one that matches OEM oil.

Just did a major service using castrol 10w40 Maganetec with new Iradium spark plugs etc. Car is super smooth & pulls strings & no overheating.

I recommend 5W40 Castrol Syntec! Here's why: Smaller numbers = thinner oil. The "W" means "Winter" - or the viscosity of the oil when the engine is cranking, and first warming up. The 5W oil is very thin when cold. The engine will crank faster, the pump primes better. The hydraulic lifters in your 16v will fill up and follow the camshaft better and with less noise. When you are at operating temperature, the 40 weight oil will give you the protection that a VW engine needs.

I use 5w-40 Castrol Syntec without any issues.

Edge worked great for me. Maybe the best oil on the market.

Just put mine in today at the owners manuals advice, 15,000 KM. Castrol 5w40

I prefer to use castrol gtx 20w-50 year round, but I'm being cheap lately. I've put over 120k on my 16v with this stuff so far

Dealer put Castrol SLX Professional LL03 5W30 in it.

I'm using Edge 5w-30 too. Seems to do well in 1.8t... This is the dealer OE oil, if it's VW 504 it could be a problem with lowered additive levels for emissions protection, which does not work well with our fuel and engine tune in North America, although it is necessary to use in TDIs (VW 507). imo, Edge is the best of all words, a premium base oil, but with more additives than VW 504 or other low saps oil.

I use Castrol 10w-40 and it works great. I have no issues with the cam follower and also never have to add oil in between oil changes.