What are semi-synthetic engine oils?

Semi-synthetic motor oils help protect your engine.

Shell Helix semi-synthetic or 'synthetic technology' engine oils make use of both synthetic and mineral base stocks to achieve higher performance levels that can be formulated from mineral oils alone. With our active cleansing technology, Shell Helix synthetic technology engine oils go on cleansing and protecting to help keep your engine feeling like new, and they provide low oil for less frequent top up.