just used Mobil 1 and ill NEVER USE IT AGAIN! back to the reg old motorcraft 5w20. Im not racing the car much so using a true synthetic is a purely a waste
Mobile 1 here. Used it in my L as well. My father in-law had bad experiences with royal purple that turned me away from it. Might try the amsoil one day (used to run it in my dirtbikes)
Amsoil signature series synthetic motor oil is the best hands down!!!! Severe condition change interval=15,000 miles , non severe change interval =25,000 miles... its all in the Stats:
TYPICAL TECHNICAL PROPERTIES
Signature Series 5W-20 Synthetic Motor Oil (ALM)
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)
8.8
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)
50.5
Viscosity Index (ASTM D-2270)
153
CCS Viscosity, cP @ (°C) (ASTM D-5293
4054 (-30)
Flash Point °C (°F) (ASTM D-92)
228 (442)
Fire Point °C (°F) (ASTM D-92)
246 (475)
Pour Point °C (°F) (ASTM D-97)
-51 (-60)
NOACK Volatility, % weight loss (g/100g) (ASTM D-5800)
5.70%
High Temperature/High Shear Viscosity
@ 150°C, 1.0 X 106 s.-1), cP (ASTM D-5481)
2.8
Four-Ball Wear Test @ 40 kgf, 75ºC,
1200 rpm, 1 hr, scar diameter, mm (ASTM D-4172)
0.35
Total Base Number (ASTM D-2896)
12.6