When do petroleum companys start adding anti-waxing?

**paul_sri150** · 29th November 2010, 20:29

Just wondering after reading a few threads, when do the oil companies start adding winter additives? I.E the anti waxing in diesel?

Also wondering as my diesel seems to smell a little more that usual on start up with a puff of smoke

**m8internet** · 29th November 2010, 23:19

It is usually applied between October and April
Some people notice the drop in MPG then a sudden rise

**paul_sri150** · 29th November 2010, 23:22

Originally Posted by m8internet

It is usually applied between October and April
Some people notice the drop in MPG then a sudden rise

Top man thanks

I have noticed quite a drop in MPG and a bit of a whiff on start up, explains alot

**bigdave1701** · 29th November 2010, 23:26

I'd noticed a drop in mpg (42 down to 38) recently and it does smell more too. I just put it down to the engine taking longer to warm up due to the cold, I didnt realise they put extra stuff in the diesel in winter! Im assuming theres a reason why they do?

**Bigtee** · 29th November 2010, 23:33

Originally Posted by bigdave1701

I'd noticed a drop in mpg (42 down to 38) recently and it does smell more too. I just put it down to the engine taking longer to warm up due to the cold, I didnt realise they put extra stuff in the diesel in winter! Im assuming theres a reason why they do?

So it does not freeze.

**cont1204** · 30th November 2010, 00:15

Originally Posted by bigdave1701

I'd noticed a drop in mpg (42 down to 38) recently and it does smell more too. I just put it down to the engine taking longer to warm up due to the cold, I didnt realise they put extra stuff in the diesel in winter! Im assuming theres a reason why they do?

Diesel, when it's cold enough becomes all thick and gloopy which can't be sucked through the fuel lines properly, if at all. Not the runny substance it normally is. An anti-waxing agent is added to the fuel to stop it happening.