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Are synthetic motor oils capable of extended drain intervals?

April 26, 2017capable drain extended intervals motor Oils synthetic

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Are synthetic motor oils capable of extended drain intervals?

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Some are and some are not. The only way to know for sure is to go by the oil manufacturers specifications. This can also be verified by oil analysis testing at different intervals during use. AMSOIL INC. specifies 25,000 mile/1-year drain interval and 35,000 mile/1-year intervals with the 0W-30 Severe Service synthetic, without by-pass filtration. If by-pass filtration and oil analysis is used, then drain intervals can be extended until the lab results indicate the oil needs to be changed. This can be many years and several hundred thousand miles depending on the variables.