Before draining old oil, first add an additive?

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Black colored oil on a Diesel is no reason for a flush. It's normal.
Deposits would be a reason for a flush but the OP didn't tell us
anything about deposits, residues, debris etc..
OP should tell what car, engine, age, mileage (km) and where in
Europe he lives. Pictures of the valvetrain would perhaps help too.
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kschachn said:
Why would the addition of a small amount fluid with relatively little additives compared to motor oil itself have a positive effect?
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Hasn't the use of ATF as an engine flush/cleaner been debunked and shown to have little, if any, effect on cleaning up an engine?
 
blufeb95 said:
The point was that ATF hasn't had any efficacy as a flush since Type A/B ATF was a thing, Dexron was explicitly formulated without whale oil, so Dexron has never been a good flush.
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It has detergent in it, check the insides of any Dexron fed autotrans, you may find metallic stuff from the clutch packs & bits of plates, but there's no coloring of the valve body or case or one-way sprags or drums or pump. Clean as can be, 150k, 250k, 300k. It doesn't allow build up. At least I've never seen it in 30 years.
 
vw7674 said:
It has detergent in it, check the insides of any Dexron fed autotrans, you may find metallic stuff from the clutch packs & bits of plates, but there's no coloring of the valve body or case or one-way sprags or drums or pump. Clean as can be, 150k, 250k, 300k. It doesn't allow build up. At least I've never seen it in 30 years.
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It's significantly less detergent than engine oil, it doesn't work as a flush.
 
vw7674 said:
It has detergent in it, check the insides of any Dexron fed autotrans, you may find metallic stuff from the clutch packs & bits of plates, but there's no coloring of the valve body or case or one-way sprags or drums or pump. Clean as can be, 150k, 250k, 300k. It doesn't allow build up. At least I've never seen it in 30 years.
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Buildup of... what? In a transmission there is no gasoline, no combustion, no blowby, very little if any moisture through whatever venting it has, and in general none of the conditions and ingredients necessary to cause or allow any buildup.

No widely used ATF in the last 40+ years has any significant detergency or cleaning ability. The inside of a modern transmission may look very clean compared to the inside of an engine but its not because of any (nonexistent) cleaning ability of the ATF.
 
JavierH19 said:
I remembered that it was maxima and i went to find the pdf but it looks like they updated it since it's newer looking and removed the hths but at 9.1 kv40 and 49.1 kv100 it's most likely gonna have a 3.0 hths they just no longer list it.
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Probably the other way round, but even with 9.1 cSt at 100°C I wouldn't
go that far and say 'it most likely' is a HTHS of 3.0 mPas. Perhaps, yes.
.
 
vw7674 said:
It has detergent in it, check the insides of any Dexron fed autotrans, you may find metallic stuff from the clutch packs & bits of plates, but there's no coloring of the valve body or case or one-way sprags or drums or pump. Clean as can be, 150k, 250k, 300k. It doesn't allow build up. At least I've never seen it in 30 years.
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Because a transmission is clean, the ATF is a good cleaner? Hardly.

It’s clean because the transmission doesn’t see combustion byproducts.

The transmission is clean because dirt, acids, and junk from combustion is not introduced to the transmission the way it is in a crankcase.

Transmission fluid is formulated with much lower detergency than motor oil because the operating environment and conditions are so different.

Transmission fluid is not a cleaner. Motor oil does a better job cleaning.
 
Years ago a co-worker of mine would drain his oil and then add a gallon or so of diesel to his crankcase as a flush...he would run that for a short time (30 seconds or so) and drain it..then re-fill with whatever oil he chose. I wouldn't have done it but he never had an engine go out on him...

PS: I agree that black oil in a diesel doesn't mean the engine is full of deposits...just change the oil and carry on.
 
1.5DCI said:
Before draining old oil, add first an additive? Is that safe to do in a 1,5Litre diesel engine?

I Just bought this used car and the oil is black, black and stinks. I was wondering can a oil additive have some benefits? I live in Europa.
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Answer yes, run engine for maybe 15 mins then carefully drain old oil, it will be hot, wait and then remove filter. Way back I used to fill with Flushing oil when it was $1 a gallon in England. pbm just posted same thing
 
pbm said:
Years ago a co-worker of mine would drain his oil and then add a gallon or so of diesel to his crankcase as a flush...he would run that for a short time (30 seconds or so) and drain it..then re-fill with whatever oil he chose. I wouldn't have done it but he never had an engine go out on him...

PS: I agree that black oil in a diesel doesn't mean the engine is full of deposits...just change the oil and carry on.
Click to expand...
Same for a redneck engineer I knew, well he was actually an engineer. Drain, fill up diesel, run for a bit, dump and fill. He did get high mileage out his autos though..
 
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