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I use Penrite Enviro+ GF-S 5W30 in my BF Falcon, which has 250k on the clock. Being a Barra, 250k is barely run in and the engine still runs like...

Whoosh, hiss, fart or squeel is brake booster going. They are cheap to replace. If you have petrol and have a stumble/misfire when you press pedal...