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I use 5w-30
have used
Royal Purple
Mobil 1
Nulon Race oil
Castrol something or other..
plus a few others
i change it out every 7500km (now pushing 120000km, so 16 oil changes)
never had one tested by a lab, so can't really comment if they did their job properly or not.
I can only assume a decent, fully synth oil would be satisfactory.
Next I am going to give Amsoil a run, hear nothing but good things about them.
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