ajurquhart Posted September 7, 2023 Share Posted September 7, 2023 Hello, went into the dealership for some top up oil, gave me longlife IV , car was serviced last year with Longlife III, I have read that the newer longlife IV is not backwards compatible…. Quote Link to comment Share on other sites More sharing options...
Magnet Posted September 7, 2023 Share Posted September 7, 2023 Hello Alistair, As I understand it (Quantum) Longlife 3 is a 5w/30grade oil, whereas Longlife 4 is a 0w/20 grade. Have you consulted your handbook, which should give you the correct grade - often under ‘Capacities’. ? I too would be reluctant to use LL 4 without thorough research. Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
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