There are semi-synthetic oils in 5w40 (Shell Helix HX7) and 10w40 (Valvoline, Shell) viscosities. For mineral oil, you can opt for 10w30 (Idemitsu) or 15w40 (Shell HX5).
20w50 is just too thick for small engines. Even with big 4-cylinders (2.0L or more), I would not even recommend it.





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