Is C15W-30 Oil Fully Synthetic?

1 Answers
AlexRose
08/31/25 5:21am
C15W-30 oil is fully synthetic. Here is some extended information: 1. Fully synthetic oil: Fully synthetic oil is entirely manufactured through chemical processes that decompose various natural substances and then synthesize them with other materials to produce the oil. The advantages of fully synthetic oil include high cleanliness, strong fluidity, excellent cooling effects, outstanding oxidation resistance, and a longer replacement cycle, typically around 1 year or 10,000 kilometers. Vehicles with turbocharged engines are recommended to use fully synthetic oil. 2. Semi-synthetic oil: Semi-synthetic oil is a blend of synthetic oil and mineral oil, with a ratio of 4:6 between mineral oil and synthetic oil. The characteristics of semi-synthetic oil include having some advantages of synthetic oil while being cheaper than fully synthetic oil. However, its performance in all aspects is weaker than fully synthetic oil, with the only advantage being its lower price. The replacement cycle is also slightly shorter than fully synthetic oil, around 7,000-8,000 kilometers or 8 months. Semi-synthetic oil is more suitable for naturally aspirated engines.
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