Quote:
Originally Posted by Tokay444
Standard Mustang GT 5W-20. Track pack? 5W-50. Exact same engine.
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I will agree with you. Everyone is always stating that the “engine was designed for that weight” Not a correct statement. The engine was designed for a certain oil viscosity. This changes when you change the operating parameters(Temerature) of an engine. Another case in point is the 2GR-FE engine. In a Lexus it takes 0W20. In an Lotus Evora it calls out 5W40. Lotus does nothing to the engine except add a supercharger to it.