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Can Semi-Synthetic and Full Synthetic Engine Oils Be Mixed?

1 Answers

LaElliot

07/29/25 9:54pm

Semi-synthetic and full synthetic engine oils cannot be mixed. Full synthetic oil does not contain mineral oil, while semi-synthetic oil usually contains a small amount of mineral oil. Full synthetic oil can operate over a wider temperature range and has a longer service life. Mixing them will reduce the service life, and the different viscosities of these two oils also result in different protective effects on the engine. Below is more information about semi-synthetic and full synthetic engine oils: 1. Semi-synthetic oil: Semi-synthetic oil is a type of automotive engine oil made from semi-synthetic base oils, specifically Group III base oils. It is a refined product of mineral oil through hydro-cracking technology, consisting of a 4:6 ratio of mineral oil to full synthetic oil. Semi-synthetic oil's purity is very close to that of full synthetic oil, but its cost is slightly higher than mineral oil. It serves as an ideal transitional product from mineral oil to synthetic oil. 2. Full synthetic oil: Strictly speaking, full synthetic oil refers to high-quality oil products made entirely from PAO (polyalphaolefin) or synthetic esters, usually labeled as "synthetic" on the oil container. Oils blended with Group IV and Group V base oils without the addition of mineral oil can be classified as full synthetic oil.

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