Originally Posted By: Pablo
Where are the approvals for Lucas or
Castrol?
Ford does list and offically endorse Castrol SuperCar 5w50. One can trust THAT oil to be the right one:
2018 Ford GT Owner's Manual excerpt:
Originally Posted By: Pablo
They know darn well what the specs are. API SN is not a hard requirement for FORD WSS-M2C931-C.
Knowing ain't the same thing as
doing. SN not a prerequisite for WSS-M2C931-C? Are you sure? Reference source for that? Did you buy a copy of the Ford spec? ... Because your statement contradicts opmustang.com 's "
If you have a vehicle built in the last few years your owners manual will show WSS-M2C931-A, B or C. C is the latest Ford Spec which now meets SN API requirements. The B suffix was phased out last year which was an SM rated oil." statements.
Your statement also contradicts the
https://standards.globalspec.com/std/1551945/ford-wss-m2c931-c standards title:
That means Lucas is disqualified, technically, since its SM still.
https://lucasoil.com/pdf/TDS_Syn-SAE-5W-50-MO.pdf
Originally Posted By: Pablo
I
know you don't like Amsoil, and that is fine.
Oh, you "know" this. I never said that. Actually, I'd use Amsoil for something off the Powertrain Warranty. For racing or modded-off-warranty vehicles, Amsoil is a good choice. (Even then, for high mileage vehicles I prefer 'High Mileage' style oil, which Amsoil refuses to offer.)
These days, with things like M1 Annual Protection and Ravenol out now, there is little need to buy Amsoil, but its very likely good oil too. Redline is in the same category as Amsoil, its missing API and 3rd-party-verified approvals many times, but good oil.
Main principle: 3rd party certifications and approvals are important for warranty purposes if they (GM, Ford, etc.) wants to be strict. And they might.