Engine oil Castrol or Motorcraft

That's a good oil. I used it before I switched to 10w-50 Castrol.

A3/B4 is a rating for just protecting the engine.

Castrol edge 5w-30 LL is oil with just C3. So it's mostly for protecting DPF. If you have a diesel engine with DPF then this is a good choice. If not something else would be better.

I switched to synthetic after doing a piston soak. Sticking with synthetic here on out. I initially ran conventional Castrol 5/30 then blend as conventional was not available through Amazon and then synthetic to try to stave off carbon build up on rings after a successful piston soak.

switch to 5w20 as according to fords bulletin for oil, i been using motorcraft synthetic blend for 26 yrs

I've been using Castrol Edge 5w-40 for years and have had good results, but wondering what others are using. I initially used Mobil1 0w-40 but got a lot of lifter noise which disappeared after switching to Castrol.

Castrol 5w30 high mileage performance, keeps the sucker in tiptop shape

My 25 year old Camry requires 5W-30 and I use Castrol Edge. I also put 1 litre of Castrol GTX 15W-40 oil into the mix - it's supposed to have anti sludge properties and also lowers the overall cost.

From my experience with a Toyota echo; does not matter the brand, only the type. My echo was a 10w40 semi synthetic. once she started consuming a little more oil, I was then just filling her up with any 10w40 semi synthetic I could afford. There was no difference of her running on Castrol vrs the mixed bag of what it ended up with, as I always put Castrol as my oil of choice for a complete change.

Currently using Castrol Edge 5w-40 fully synthetic, previously was using Estremo Heatpro 5w-40 FS, differences is so minimal to the point where you just neglect and forget about it....

Smoothness the same, silky smooth.

Car feels slightly like just slightly lighter on pickup with Castrol.

I hated the castrol, I could tell the engine was louder with it compared to Pennzoil.