Audi Junkie

If you see temps below freezing, a 20w may not crank. Good cold flow will reduce the main cause of wear, cold start-up. 20w-50 is weak sauce.<ul><li><a href="http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=1;t=005358#000001"> http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=1;t=005358#000001</a</li></ul>

Audi Junkie

CASTROL RX 15w-40 Super Heavy Duty Multi-Grade
Engineered for car and light truck diesel and gasoline engines.

Provides superior protection from piston deposits, oil thickening and valve train wear while minimizing engine sludge formation.
Meets Mercedes Benz and Volkswagen API passenger car performance requirements.
Engineered to provide superior performance in engines operating under severe service conditions, including towing and hauling under high temperatures.
Applicable for on and off road heavy duty 4 stroke trucks, gasoline and diesel light trucks and passenger cars where API CI-4, CH-4,
CG-4, CF-4, CF or SJ are recommended.
Special viscosity improvers, anti-wear, anti-oxidant and detergent additives protect and maintain cleanliness in hot running, heavy duty diesel and heavy duty gasoline engines.

Exceeds the performance requirements of API Service: CH-4, CG-4, CF-4, CF/SJ, SH.

Castrol RX Super SAE 15W-40 exceeds performance requirements of Mack, Cummins, Navistar, Detroit Diesel 4-stroke engines where API CH-4 is required, GM 6085M, GM 6094M, Ford
ESN-M2C121E, ESE-M2C153G and F. Approved against the performance requirements of Mack EO-M.

&gt;&gt;&gt;COMPARED TO:&lt;&lt;&lt;


SAE 20W-50: is a premium, super multigrade that guards against wear by providing a superior oil film strength and extreme high temperature strength. 20W-50 exceeds API service SL, SJ and SH. Also exceeds the engine protection requirements of ILSAC GF-3 for API Certified Gasoline Engine Oils.<ul><li><a href="http://www.castrolusa.com/products/default.asp?prod_mp=1">http://www.castrolusa.com/products/default.asp?prod_mp=1</a</li></ul>