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Unread 09-22-2015, 01:31 PM   #1
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Default Completely draining oil when doing an oil change

I was recently doing some work at a DIY shop on my girlfriend's car and this included an oil change. When I was draining the oil, the guy who ran the shop came up and shared some information with me that I'd never heard before.

He advised me NOT to completely drain the old oil out of the pan. His reasoning was that if you totally drain it and then refill (rather than leaving some in and then refilling), the oil pump will run dry for a few moments when you start the car and you'll hurt the engine. He claimed that if I were to drain it completely I'd probably hear some knocking when it first starts back up.

I found this advice very strange because in all the oil change tutorials and videos I've watched, I've never once heard this recommended. Additionally over all the oil changes I've ever done where I'd completely drained the oil this has never been an issue and I've never heard any knocking or any sign of distress from the engine after starting it back up.

Any input on this?
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Unread 09-22-2015, 08:03 PM   #2
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Cars can withstand a second or two of no oil pressure. Yes, he's technically right, but no it's not anywhere near necessary.

It's also impossible to get ALL the oil out in the first place. There's going to be some left pretty much everywhere.
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