Why is Semi-Synthetic oil often recommended?

Why is Semi-Synthetic oil often recommended?

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Malcster

Original Poster:

642 posts

172 months

Friday 11th March 2022
quotequote all
Why is Semi-Synthetic oil often recommended for the speed six? (10w40 seems to be the general opinion)

The only real advantage to Semi over Fully-synth seems to be that it is cheaper. But not but a huge amount really.

The advantages to fully-synth surely outweigh that? Particularly for an engine that has lubrication flow issues when cold:

- It's better at withstanding hot and cold temps
- It flows better
- It produces less sludge / deposits
- It creates a more robust film at high temp / high load

Maybe I'm missing something?
Any oil gurus out there?