If you think it doesn't matter what brand of oil you use, think again. Rachael speaks with Michael Inserra of Castrol Australia about how constant changes to specs from the OEMs make servicing in the aftermarket increasingly complex, and what you should be looking for from your lubricant supplier. Whispering Loudly, The Workshop Whisper's Podcast thanks to sponsors Safe-T-Stop and Mechanic Desk. Find out more about the Workshop Whisperer here. 

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