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Engine Sludge: Any Updated Fix?

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sleddriver
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Re: Engine Sludge: Any Updated Fix?

Post by sleddriver » Wed Jul 11, 2018 7:42 pm

I've used BG109 engine flush twice on a hot motor with idle raised to about 1500 RPM and hood open for about 15min. Oil viscosity was reduced to zero, used oil was jet black as it flew out of the pan. Also drained engine oil cooler and line.

At this point you could fill with cheap oil + new filter and drive for a couple of hundred miles, then drain and refill with 100% synthetic + new filter.

Don't understand why engine flushes are verboten on turbo cars as some claim. No problems here.


1998 V70 T5 226,808 miles. Original Owner.
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Rattnalle
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Re: Engine Sludge: Any Updated Fix?

Post by Rattnalle » Thu Jul 12, 2018 1:23 am

Since the turbo spins on the oil film it'll wear quickly if there isn't one or if it's too thin.

I did flush mine with flushing oil, that is i added new oil sold with added cleaners already in it, and it came out black after 15 min of idling at 650-ish rpm. The instructions were very clear on not running the engine at more than idle with the oil in.



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Re: Engine Sludge: Any Updated Fix?

Post by mrbrian200 » Sat Jul 14, 2018 9:53 am

sleddriver wrote:
Wed Jul 11, 2018 7:42 pm
Don't understand why engine flushes are verboten on turbo cars as some claim. No problems here.
It's not just the turbo I'm worried about. I'm wary of flushes on any higher mileage engine that hasn't been flushed at least once in a while from new. If too much chunky crap thats built up come loose all at once you run a risk of plugging small oil passages and the pickup screen. On these you add turbo oil passages to the list.

If you buy a car new or well maintained-low mileage under 40k miles then go ahead and flush every so often.
But when you buy a used car with 100k+ on the odo that is obviously filthy be careful how you approach the matter.

One of my previous cars, a '90 Ford Taurus acquired from a relative, after a quickie lube recommended a flush on that higher mileage car (around 100k miles) the sump screen plugged solid within a couple days. My aunt was ready for a newer car anyway so she ran out and bought something else and offered it to me 'free if you can fix it'. She stopped driving it when the oil pressure light came on and it got noisy at idle. I wasn't sure how much damage was done. ~$12 for a new sump screen and an afternoon to drop the pan/clean it out was worth finding out. With some luck it turned out that the engine was ok and I took it.



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Rattnalle
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Re: Engine Sludge: Any Updated Fix?

Post by Rattnalle » Sat Jul 14, 2018 11:19 am

A well maintained high milage engine shouldn't develop any issues. On the other hand it shouldn't need it either.

Regardless just doing shorter intervals is the safer option.



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sleddriver
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Re: Engine Sludge: Any Updated Fix?

Post by sleddriver » Tue Jul 17, 2018 1:04 pm

mrbrian200 wrote:
Sat Jul 14, 2018 9:53 am
sleddriver wrote:
Wed Jul 11, 2018 7:42 pm
Don't understand why engine flushes are verboten on turbo cars as some claim. No problems here.
It's not just the turbo I'm worried about. I'm wary of flushes on any higher mileage engine that hasn't been flushed at least once in a while from new. If too much chunky crap thats built up come loose all at once you run a risk of plugging small oil passages and the pickup screen. On these you add turbo oil passages to the list.
Where you live is very different weather-wise from here in the heat. Not just extended periods of extreme cold but salt as well.

To have that much goo and globs of it not only make it down to the pan, but clog up the oil pickup indicates a severely neglected engine. Like something run 30kmi on conventional oil without a change. Unfortunately there are 100,000's of people so clueless.

As long as the oil & filter has been changed regularly, flushing won't hurt a thing. Much better to use synthetic oil on any turbo motor. I would also expect doing so would prevent any PVC clogging issues as well.


1998 V70 T5 226,808 miles. Original Owner.
M1 10W-30 HM

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