Which engine oil additive have you used?

[kentish_bloke]

Just a small poll to see which engine oil additives people have used & how happy you have been with them.

[kev77]

I used wynns super charger the other day the one for petrol and diesel cars and it seems great engine really gone quiet now aswell foe a diesel engine seems more solid

[DasArab]

Used ZX1 in a cavi sri a few years back was getting an extra 40 miles from a tank of petrol so that defiantly worked, ran a lot cooler too.

[fikse]

Ordered today several QMI products: Metal treatment for both engine and auto gearbox, engine cleaner, turbo cleaner, treatment for cooling system and power steering, and finally some diesel-booster. Looking forward to put it in within the next weeks :)
Have used it on former cars, bikes, grascutters and other small-engines, with great success.

[xrken]

its got to be slick 50 its the best thing you can do for your engine :tea::tea::tea::tea:

[dv8]

I have used slick50 in the past, TBH couldt say it made a difference, other than the placebo effect.

Are any recommended for use in the 1.9CDTi engine?

[markm]

I've tried lots of different products, all useless IMO , other that it made the oil leve light come on in the wifes old car, almost as soon as I put it in,

Now I just use Mobil1 oil, saves the bother of using the stuff :D

[DKM]

I've used slick50 in the passed, did'nt do much other than i gained very slight MPG increase.
The best course of action for anyone interested in engine longevity/maintenance is to change the oil twice a year, i always have with all my cars and never had engine problems.
Over service them and engines will thank you for it.

[Big Sig]

They are mostly anti wear additives that are in moden oils anyway. They will make a difference as they coat everything to help prevent wear, however they also coat the tiny oil ways making them smaller - although have no idea how much smaller!

Enough to make a difference?

Maybe, maybe not anyone know for sure as I guess its only a few microns.

[felixx]

I have used slick50 in the past, TBH couldt say it made a difference, other than the placebo effect.

Are any recommended for use in the 1.9CDTi engine?:ban:I have been doing a lot of research on the web relating to oil and the right grades to put in your car.On nearly all the sights the manufacturers do not recommend you to use them at all.Absolutely.They say that the varnish and coatings that have built up over the years,protect the engine and that by adding these detergents,which in lots of cases are very aggressive,can cause damage by removing these coatings.IMHO,I think you should steer well clear of them.Oil companies spend millions of pounds refining and developing oils and in lots of cases,your putting back the products that they have already removed.FELIXX.

[rushy]

Yep VX mention in TIS not to use oil additives.

[Grumpy1954]

Used several, never actually noticed them make much difference. Nowadays I just go with changing the oil and filter with recommended or better twice a year

[carpet]

NO additives whatso ever!! Just a good quality engine oil (Magnatec in my case) as most manufactures suggest.

[fikse]

First of all: I agree with all sceptic people here. Most of the oil additives available for us end-users is of no good. Many good oils sold today already have several anti-friction additives, so to mix this with another brand/another chemicals could end tragic, but in most cases it ends with little or no good, and waste of money.
There are exeptions though!
RVS ceramic, a finnish producer of a russian concept: Ceramic metal treatment. Able to build up worn metal surfaces. I know people who used this on their completely worn dieselpump, ended up with a pump that worked as new. Only affects metal-surfaces.
QMI, a PTFE metal treatment. This is NOT an oil additive, as many other so-called PTFE treatments. I have many succesful stories and none negative with the use of this products, both experienced by myself and others. Only affects metal-surfaces.

And as I scribbled in a post above in June, I ordered a complete set of treatment for my car. In beginning of July I put some of it in:
Engine: Put in internal engine cleaner, drained and flushed with some cheap oil, put in new filter, new oil (Royal Purple 10w-40 for diesel), and QMI metal treatment.
Turbo: Turbo cleaner. A water based solution with PTFE to remove soot and make the surface on turbo and all inlet as slippery as possible. Sprayed in the air inlet while engine is running.
Autogear: Since I have flushed all oil just a half year ago, I just removed the same amount (2.5 dl) oil as the QMI stuff I added.
Engine cooling: Removed the same amount cooling liquid as the QMI stuff I added.
Powersteering: So far not done this.
Also I use a QMI diesel-booster every time I fill diesel. This to prevent moisture and "diesel-animals", to lubricate all fuel line.

So far the car has runned approx 3.000KMs since this job was done (QMI says at least 3.500KMs before the job is completely done)
Result: Engine sounds to run a bit smoother. It starts easier, even it was OK before. It takes longer time to reach operating temperature. Im unsure wether to say this is negative or positive in total... A bit less vibrations. It just sounds to run better, but of course this is only subjective.
In the autogearbox, the results are extremely amazing, and 100% positive. Its just like getting a new gearbox. Before treatment it had a tendency to shift hard in some occations, annoying often, and never very smooth. Also it had a tendency to "hang" in one gear, a few seconds more than I enjoyed. AFAIK pretty normal behaviour for a 140.000KMs autogear, nothing dramatic, only a bit worn.
Now, its 95% completely smooth. In "normal"/limited acceleration, it is almost impossible to notice gearing, it stays at almost same RPM all the way. This is NOT to mix with slippering, it accelerates better than it used to. Actually, RPM in general seems a bit less than before treatment, but this could also be of more power from engine. Still, it have a tendency to hard shifting from 2 to 3 when the gearoil is still cold, but this behaviour was more or less constant before, at all temperatures. Also I still have some hard when gearing down from 4 to 3 in speeds above 70KM/h, a bit less hard now but still there.
Now I also can see/feel the "overdrive" function: I.e. at 50-60KM/h (5th gear autoselected) and very low acceleration up to 70-80KM/h, it maintain its lowest RPM possible for the gear (normally it is now 12-1400 RPM) instead of 1700-2000 RPM. This is also possible to achive at very sleek uphills and maintaining i.e. 70KM/h. If i get a little harder at throttle, it will raise up to 17-2000, still at 5th gear. This "overdrive" I have hardly experienced before I treated the gearbox: It used to raise RPM up to 2000RPM as soon I tried to even soft accelerate or going sleek uphill. This is not to be mixed with gear-lock, who is not locking the 5th gear before approx 100KM/h (or 4th at 80KM/h and 3d at 50).

In total:
Fuelconsumption is lowered by 8-10%, depending on long distance or city.
Noticeable but not big differences in engine sound/behaviour.
I just got myself a new gearbox for £20!!! :clap2:
Faster throttle response. I imagine the turbo is spinning up faster, and this is explanation, but not sure.
More power! Close to home I have a steep uphill, where before treatment max speed was 75-78 KM/h before a sharp curve at the top of the hill. Now I reach 88-93KM/h before I have to release throttle of safety reasons :eyebrows:

[moose]

Just a small poll to see which engine oil additives people have used & how happy you have been with them.

I don't use an oil additive I always change the engine oil & filter well below manufacturer's recommended interval.

Modern oils shouldn't really need an additive but thats my opinion......each to their own.

Oils always trigger very varied debate on bike forums with some interesting views.

I do put injector cleaner in every few tankfulls

[felixx]

:ditto:
I don't use an oil additive I always change the engine oil & filter well below manufacturer's recommended interval.

Modern oils shouldn't really need an additive but thats my opinion......each to their own.

Oils always trigger very varied debate on bike forums with some interesting views.

I do put injector cleaner in every few tankfullsI think that's all that is needed.If you put a good quality additive in your tank,especially diesel as it helps keep the pump oiled,you can't go very far wrong.FELIXX.

[Tony W]

None...

[ed taylor]

I would have added None to the poll too. As already said, and I would have said the same. I don,t recomend putting any in, neither do Vauxhall.