I always wait till my vrs has warmed up till i boot it but what would it actually do to the engine if i ignored this ? 

in the short term not alot .... but as the oil is colder and thicker parts may not be getting full lubrication and you could accelerate engine wear by hammering it from cold 

Screw your engine up pretty fast, turbo and engine bearings etc won't get lubricated properly which is why you should let it warm first

Oil will have adequate lubrication from cold to avoid premature wear or starvation as suggested, most modern oils are very thin so I would not worry too much.

 It is good to drive your car in a way that it can warm up efficiently but if you need to move on in a spritely fashion this will warm things up a bit quicker.

 

 

 cold oil is good at lubricating it has a higher viscosity and better lubricity than hot oil that has low viscosity and less lubricity, I tend to be more concerned when oil is up over 120'C that more wear could occur.

I don't do it too often so not a worry really. Just notice that it is like a slug when cold. I tend to just drive in a lower gear and higher revs till it warms up without putting my foot down.

I think the number one important thing contributing to engine wear is the quantity oil on the dipstick.

 

More important than type, brand, temperature, etc etc. I bet if you looked at premature wear this would be the most important factor. So its all within balance.

 

If one time you forgot to check your oil and it was below the dipstick, I bet this would be far more significant than all those times when you maybe set off a bit more spritely than usual etc.

Another risk besides the negative points already raised will be likely bore wash as the fuel mixture will be rich so will wash any oil from the bores increasing bore and ring wear.IMO you shouldn't rag your engine until its up to operating temperature, but its your choice!

I notice my fuel drops like a stone so that's my main reason ha ha 

I agree about not ragging cold ( who in their right mind does ) but worth putting into perspective, if you are the kind of person that doesn't bother to check your oil this is the number one problem for engine wear. No oil = wear and the viscious cycle then continues

Another risk besides the negative points already raised will be likely bore wash as the fuel mixture will be rich so will wash any oil from the bores increasing bore and ring wear.IMO you shouldn't rag your engine until its up to operating temperature, but its your choice!

Do diesels suffer from bore wash? I thought that was petrol engines, where neat petrol washes down the bores, removing the oil. in a diesel, it would be diesel which is akin to oil.

Short term, not much. Long term... probably cause premature failure of seals, gaskets, turbo and other engine and engine related components.

 

The oil pressure is a LOT higher when cold and the thermal shock on the metals the engine block and components are made from won't do any good either.

 

Basically drive with mechanical sympathy until everything is nice and warm. I usually let the car idle for ~30 seconds before driving off in the mornings. Once the temperature has reached ~90c give it another 5-10mins for the oil to get up to temperature (this takes longer than the coolant) before driving enthusiastically.

Its gonna be the turbo that takes the stick isn't it? Common sense says to warm it up before putting your foot down but then I guess it depends on your meaning of putting your foot down?

If I drove my car to work without a little acceleration, probably hitting 3.5k revs, it would never warm up. I dont give it the full beans until fully warmed up however.

I'd hate to buy a car from anyone that I knew gave it the beans from cold.

Absolutely no point in doing so, and it can only be detrimental in the long run for reasons stated above. Ask yourself the questions, what is the oil pressure when cold vs hot, and, what is the optimum temperature for an engine to operate under?

Do diesels suffer from bore wash? I thought that was petrol engines, where neat petrol washes down the bores, removing the oil. in a diesel, it would be diesel which is akin to oil.

I'm no expert on diesels so couldn't say TBH but diesel isn't as good at lubricating your engine as fully synthetic oil. Common sense would suggest it wouldn't do any good though. Its a well documented fact that most engine wear takes place when the engine is cold, before its up to operating temperature so driving it like you've stolen it from cold will only make this worse.

All modern engines are designed to work best when up to temperature when the engine tolerances are at their optimum. Its not just lubrication thats an issue, things like the affect it could have on the head gasket need to be considered too

Accelerated top-end wear happens when engines are revved right after starting, ideally allow the engine to tick over or drive away gently keeping revs as low as possible, after a pretty short time oil pressure is at maximum and the car can be driven normally, once the temperature gauge starts to move you can give it death without any ill effects. Similar rules apply when starting from hot, all you need is full oil pressure and you're good to go.

 

Modern engine machining tolerances and materials are very good so there aren't the dramatic dimension changes you'd think.

i hate it when i see people drive their cars like they stole it first thing on a cold morning, mind you its their car so let them drive it their way, i used to travel 60 miles a shift so by the time i get to work my engine was well warmed up and i regularly drove on the m4 motorway, now when my engine reaches optimum temp i'm switching the car off as i'm only travelling 18 miles round trip a shift. if you care for your car you would warm it up first. happy driving.

Is up to 2.5k revs alright for the first couple of miles??

I don't think I go above 2000rpm and it's always well under 1 bar boost before my temp gauge is at 90. Once it's up to temp I will give it full boost if I need to but never before. Always let my turbo cars warm up and cool down

My trip to work is 10 miles/15 min. First 2 min low revs, no boost. Then up to about 2k for a bit then near the end of the trip I take it up to 3k once or twice. Just as I arrive its warm but I'd rather get to work and it not quite be warm than smash it to get it warm before I arrive.

Is up to 2.5k revs alright for the first couple of miles??

 

 

Revving it once or twice to sensibly pull out of T junctions is perfectly acceptable. Drive it with a light foot for at least a couple of miles and don't hammer it until it's up to temperature.

 

A couple of revs and a bit of boost going up through the gears won't harm it unless it's goignt o pop anyway.

 

J.

Revving it once or twice to sensibly pull out of T junctions is perfectly acceptable. Drive it with a light foot for at least a couple of miles and don't hammer it until it's up to temperature.

 

A couple of revs and a bit of boost going up through the gears won't harm it unless it's goignt o pop anyway.

 

J.

 

I have a 5 mile journey to work, mainly down hill on the way there so can take it easy and let it pretty much roll down in a high gear

 

But on the way back it's going back up hill so i staying in a lower gear at slightly higher revs seems better then being in a higher gear and the car having to work a lot harder

here's my method, 30^o or - 5^o . Get in car, reverse out, drive it. After  < five minutes, put my foot down. The amount of heat generated quickly warms the oil up. Never had a problem TBH though I always use the correct oil and other fluids. Still on original turbo, battery older than some Fabia MkI owners and serviced regularly.

I start my car and let it idle for 20 secs or so then set off and keep my rpm down below 2k till warm. Then gently increase them.

I am of the same mind that cold oil doesnt protect the parts fully and as said is harder for the parts to move about So doesnt offer the same protection.

Also as the op said I think the car is very sluggish when cold hence why I am light on the throttle and keep tpms down as to me the car is struggling slightly so I look after it by being gental.

Hope that makes sence?

Also keeping rpm down meand minimum fuel is used and I find the engine worms up at a similar rate anyway so I save fuel. This Is one thing I love about these fabias. I done 290 mile so far and only used one block of fuel on the dash lol.

Must add too I try keeping mine between 1500 and 2k all the time which is peak torque. Never letting tge car struggle too and using the gears as it will increase wear if putting too much preasure on the engine.

I try not give it too much grief when cold, not booting it until the water is upto midpoint. Although I was told that oil heats up faster than water inthe engine so I could probably use boost earlier than I do.