2017 Focus RS - Castrol 0W40 - 4,500 miles

[53' Stude]

Originally Posted By: kschachn
Originally Posted By: 69GTX
I'm sure Castrol knows what they are doing. My comment was to the point that it appears the oil additive package has changed 3X in the past 3-5 yrs...and is back to what it was several years ago. I just don't understand that. And I can't buy it, if I don't know what's going to be in it.

So by your statement you feel that you are more capable to predict the future performance of a motor oil based on a $30 analysis than is the well-established major manufacturer?

It meets the specifications listed on the PDS, right? Which one of those do you think is compromised by you not understanding their formulation chemistry?


Yeah, I don't buy the "formulation change" theory. Some people just don't like when things change for the better. Oh well. Even M1 0w40 changed

 

[Flying_A]

Originally Posted By: aquariuscsm
I'd give Edge 5W50 a try in that car.


I believe the RS requires the Ford 937A spec which traditionally is a xW-40 grade oil.

 

[bigunz]

Is this the black bottle euro formular Castrol edge? Looks simular to the gold bottle we get over here.

 

[FlyPenFly]

Personally, I'm planning to go full Castrol 0w40 for all 3 of my vehicles.

 

[KL31]

Funny how the 40 grade ended up thicker by the end than the 50 did. That engine must pound the oil hard! Good result with the castrol!

 

[fastsvo]

Do we know if Castrol Edge 5W-50 meets the ford spec for the RS?

 

[Garak]

I would gather not, at least the last time I checked it didn't meet it for the Mustang variants that called for 5w-50.

 

[Nickdfresh]

Originally Posted By: 69GTX
...I had always assumed ALL the major mfg 0w-40 A3/B4 oils were basically high calcium, little to no magnesium. All the VOA/UOA's I reviewed proved it. It was that way a couple of years ago. I did some detailed searches for Castrol UOA/VOA's on the 0w-40 and the recent ones showed a change from high calcium/low magnesium to medium calcium/medium magnesium (500 ppm). I purged my recent Castrol Edge 0w-40 purchases because of that.
....


Why? What's the issue with using magnesium as a detergent?

 

[Nickdfresh]

Originally Posted By: fastsvo
Do we know if Castrol Edge 5W-50 meets the ford spec for the RS?


It seems to be marketed as almost a high mileage oil for older applications that could use 20W-50 last time I looked.

I'm guessing Mobil 1 5W-50 does meet the Ford spec's but IDK...