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Join Date: Jan 2010
Location: SF Bay Area
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Engine oil flushing

What do you think about doing periodic oil flushes? Using a product like Liqui Moly Oil Flush:

https://products.liqui-moly.us/pro-line-engine-flush-1.html

https://pim.liqui-moly.de/pidoc/P000065/2427-Pro-LineEngineFlush-26.0-us.pdf

Given that oil draining on our cars (with long lines to front oil radiator) is never complete, is there a problem with remaing oil flush in the lines? I was told not because this flush is compatible oil detergent. What do you think?


Last edited by adias; 06-06-2018 at 06:02 PM..
Old 06-06-2018, 05:34 PM
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Back in the day, prior to the early 1970's, even with regular oil changes, motors would fill up with sludge & crud. I've seen some really cringe-worth innards with habitual use of non-detergent oils and old leaded gas. Now you can find neither.

Modern oils typically can be run 7500-10,000 miles and engines remain extremely clean inside. I believe the "engine oil flush" has long since been relegated to "snake oil" status.
Old 06-06-2018, 08:33 PM
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Quote:
Originally Posted by adias View Post
What do you think about doing periodic oil flushes? Using a product like Liqui Moly Oil Flush:
Nothing! Though Liqui Moly products are usually good, I wouldn't want to have any of them in my oil circuit as it's almost impossible to drain the oil completely. Use high quality oil, change it on a regular basis and there shouldn't be the need for such additives.

Brgds
Alex
Old 06-07-2018, 01:22 AM
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I would only use it if you are sure you have an issue.
I used something like that back in the late 80's. I dropped a greasey part in the oil after I removed it. when I got it out it was spotless. the stuff (back then) really took the grease off. in fact, I used that "dirty oil" for a parts cleaner that day.

I just ran some through my new to me dodge Dakota but only because they are known to have sludge issues. after, I put in cheap oil and drove it for a few days then drained it again and put in synthetic.
this would be quite expensive on a 911.
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Old 06-07-2018, 02:56 AM
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I have never seen any sign of sludge in my 1979. Not when doing valve adjustments or even when replacing the oil sump screen. I don’t think it’s an issue.

Come to think of it, don’t think I’ve ever seen sludge in any 911 engine tear down photos online either.

Mark
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Old 06-07-2018, 03:19 AM
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Great advice! I agree.

Old 06-07-2018, 03:41 PM
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