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Feb 13, 2018 12:01:13 GMT
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No, not down the toilet. But heard an old tale that if you mix diesel with some old oil then chuck in your engine, run it a bit and drain, it cleans it up abit and flushes out some gunk? How true is this and what are peoples takes?
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Feb 13, 2018 13:09:03 GMT
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You can buy specific flushes for a few quid, we sell an STP for I think £3.99 its mostly kerosene based. You shouldn't drive the vehicle when you put it in as it thins the oil.
Some will say its not needed if you do very regular changes or you can break off a chunk of the built up deposits. Yeah its true but only if the engine is full of wibblepoo in which case it should probably be flushed properly or dismantled for a clean.
I like to throw one in, makes me feel better and in 10 years of using them I've had a few cars, and no oil or oil pressure related issues. Indeed the oil in my IS300 is a year old and its still clear its dark brown but see through. And that always gets a flush. My old Laurel was the same.
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Nissan Laurel SOLD  BMW E34 Diesel SOLD  Toyota Soarer 4.0 V8 SOLD Audi A4 1995 TDI SOLD Peugeot 205 1.9 TD SOLD Lexus IS300 SC |
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Oil flushingDeleted
@Deleted
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Feb 13, 2018 14:03:23 GMT
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I wouldn't want to run an old engine for very long with diesel as the lubricant. Maybe just a quick fire up and flush round the system for a couple of minutes maximum?
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Feb 13, 2018 14:11:47 GMT
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Should have said clearer, the running bit would just be starter her up and idle for 5mins on the drive just to run it around the block. Its just for my daily, I give her a service every 12months or so but its up to 160tho now and the oil is always black each change, she a diesel too if that make any difference.
Cheers
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Feb 13, 2018 14:29:47 GMT
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Every Diesel I've owned has always turned the oil black pretty quickly, even when I changed it every 5k.
I wouldn't worry about black oil in a Diesel its normal.
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ChasR
RR Helper
motivation
Posts: 10,194
Club RR Member Number: 170
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Oil flushingChasR
@chasr
Club Retro Rides Member 170
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Feb 13, 2018 14:45:55 GMT
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As said diesel oil gets dirty quite quickly due to the blowby and the soot produced by diesel. Regular changes count for alot in a diesel.
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Feb 13, 2018 15:13:55 GMT
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Cool, cheers peeps
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Davey
Posted a lot
Resident Tyre Nerd.
Posts: 2,208
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Feb 13, 2018 16:34:32 GMT
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Yep you'll probably find on a diesel that the oil is black in a couple of hundred miles.
My Skoda superb did 360k on regular oil changes never needed topping up between before i sold it, every 5k for my piece of mind. Never used engine flush.
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K11 Micra x3 - Mk3 astra - Seat Marbella - Mk6 Escort estate - B5 Passat - Alfa 156 estate - E36 compact
Mk2 MR2 T-bar - E46 328i - Skoda Superb - Fiat seicento - 6n2 Polo - 6n polo 1.6 - Mk1 GS300
EU8 civic type S - MG ZT cdti - R56 MINI Cooper S - Audi A3 8p - Jaguar XF (X250) - FN2 Civic Type R - Mk2 2.0i Ford Focus
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Feb 13, 2018 17:30:34 GMT
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Yep you'll probably find on a diesel that the oil is black in a couple of hundred miles. My Skoda superb did 360k on regular oil changes never needed topping up between before i sold it, every 5k for my piece of mind. Never used engine flush. 360k... and you sold it? Didn't you get attached? |
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Feb 13, 2018 19:11:49 GMT
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I use diesel in the engine oil as a flush, it's better than the shop bought treatments and cheaper.
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Feb 13, 2018 23:00:00 GMT
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I do 5-6k mile oil changes on all my V.A.G. TDIs and never flush, oil is black within thirty seconds of changing. Probably done half a million miles in them in ten years and never had a single oil related issue.
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tristanh
Part of things
Routinely bewildered
Posts: 990 
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A 1/2 litre or so of Cheap ATF in for a 100 miles or thereabouts works well too.
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Whether you believe you can, or you cannot, you're probably right.
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jpr1977
Club Retro Rides Member
Posts: 656
Club RR Member Number: 18
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Oil flushingjpr1977
@jpr1977
Club Retro Rides Member 18
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My dirty diesel daily civic is the same, oil is black a coal after a day , changed at 10k or annually whatever comes first but 150k and touch wood no engine issues, we just wont mention clutch's / DMF's and rattly alternator bearings...
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Davey
Posted a lot
Resident Tyre Nerd.
Posts: 2,208
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Yep you'll probably find on a diesel that the oil is black in a couple of hundred miles. My Skoda superb did 360k on regular oil changes never needed topping up between before i sold it, every 5k for my piece of mind. Never used engine flush. 360k... and you sold it? Didn't you get attached? I bought it with 250k on it so i wasn't that attached. Gave it death constantly for a year and got rid to a Polish guy who still has it apparently. |
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K11 Micra x3 - Mk3 astra - Seat Marbella - Mk6 Escort estate - B5 Passat - Alfa 156 estate - E36 compact
Mk2 MR2 T-bar - E46 328i - Skoda Superb - Fiat seicento - 6n2 Polo - 6n polo 1.6 - Mk1 GS300
EU8 civic type S - MG ZT cdti - R56 MINI Cooper S - Audi A3 8p - Jaguar XF (X250) - FN2 Civic Type R - Mk2 2.0i Ford Focus
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Feb 14, 2018 11:15:18 GMT
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Crikey!
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Oil flushingBenzBoy
@benzboy
Club Retro Rides Member 7
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Feb 14, 2018 11:18:11 GMT
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The only time I've ever used an oil flush was when I had sporadic oil starvation in a Ford CVH engine that was totally clagged up from 60k miles of going to the shops and back at the hands of an old lady. It wasn't particularly successful, and the problem remained (but the oil starvation could have been another cause... I never found out as the car died before I could do more tests) I wouln't bother with any sort of flush with an engine that has no oil-related problems, and even then I think I would be very cautious and pessimistic of it actually working. Kwik-Fit type places like to up-sell flushes but in my opinion it's at best unnecessary and at worst, snake oil. Regular oil changes and dropping the oil (carefully) while hot once in a while should be enough. The new oil in my diesel daily goes black pretty much instantly. It's just a diesel thing, don't worry about it |
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Last Edit: Feb 14, 2018 11:20:16 GMT by BenzBoy
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taurus
Posted a lot
Posts: 1,084
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Feb 14, 2018 13:52:15 GMT
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I've always changed my oil every 5k and relied on the fresh detergents to keep the engine clean.
When buying something with an unknown history I buy some cheap oil for diesel engines (on account of the detergents being stronger) and do a couple of 2k oil & filter changes. That's always worked for me.
Diesels always make the oil go black very quickly anyway.
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Feb 14, 2018 14:15:05 GMT
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I always think it's best to look at this both ways and ultimately it all depends on the condition of your engine.
SHOULD your engine need an oil flush? No, if it's been looked after and serviced regularly (provided the engine doesn't have pick-up or pcv design faults) then you're internals would have been protected and cleaned properly.
But when we're talking about older cars and the fact that not everyone is an enthusiast I think the least you should do (What I do considering a fair few performance cars could probably do with the gasket changing) is to whip the cam covers off and to visually inspect the general condition to know which course of action (if any) to take, especially if it's not just a beater, this should be a good indicator on the condition of the rest of the engine.
There's always horror stories about baked on crud clogging up engines after an engine flush but tbh I think that's mainly a coincidence, if your engine is sludged up that bad then sooner or later-regardless of a flush- it's arteries are gonna end up getting blocked because the crud is the plaque build up, not doing a flush certainly isn't going to help prevent that from happening but it may help dissolve some of the curse word along with regular changes to eventually eliminate it if done correctly.
A quick flush will clean what it can reach-where your oil goes-so in my opinion it's good practice IF it's needed, certainly not every oil change because as has already been said if you change your oil regularly then the detergents are going to help keep your engine well maintained.
IF your engine does have sludging issues then the only thorough way of eradicating it is to do it manually. Now obviously the "proper" way of doing it would be to dismantle your engine and get head/block chemically cleaned/rebuilt but that's not always a viable option. So again it would be a case of whipping the covers off one end and cleaning the curse word out the head with appropriate chemicals/tooth brush and then dropping the sump- cleaning it all out including pick-up/strainer and then getting the curse word off your internals the best you can.
However if it doesn't have sludge and it all looks clean, then I wouldn't use anything but an oil change, if you want to be extra put cheap stuff in for a week or two and then drop it for some good stuff for the next 6 months.
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