Originally Posted By: Ramblejam
The best any RX product can do is API SL, which was introduced in 2001, and is for 2004 and older applications.
Best any RX can do is API SL (tells me its good for petrol cars) and ACEA E7 (tells me its robust with high shear stability and a Noack of 13% or less). API SN has no shear stability test and has a Noack limit of 15%.
Mobil Delvac 1 ESP 5W40 is API CJ-4 / SM and ACEA E7 & E9. This impresses me more than just API SN by itself.
The ACEA specs are much harder to reach than the API specs, and requires a better formulated oil. One of my favourite oils is Castrol Edge 5W30 A3/B4, it's BMW LL-01 and MB 229.5, but only API SL. It has slightly elevated Zinc levels to reach the low OEM spec wear limits, but that crosses the API Phos limits. It's interesting, API focus on chemistry, while ACEA focus on test performance.
Having said all that, I must admit we are going off on a tangent, and if I had an Eco Boost, I would probably run Castrol Magnatec 5W30 in it, as this is producing some great Eco Boost UOA's right now.
[BITOG 13 F150 Ecoboost - Magnatec 5W30 - 7000 miles- UOA]