An evaluation of AMSOIL Signature Series 5W-30 Synthetic Motor Oil in standard and Double Length Sequence IIIG Engine Tests. The Sequence IIIG Engine Test (ASTM D7320) is an industry-standard test designed to evaluate automotive engine oils for high-temperature performance, including oil thickening, piston deposits, oil consumption and engine wear during moderately high-speed, high-temperature service. It must be passed to meet the API SN and ILSAC GF-5 motor oil specifications. Results in the 100-hour test are an important indicator of how well a motor oil will perform in real-world service.
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