New oil, made a real difference!

[PJayUK]

Just had the oil changed on my SClass this morning. Previously the car had Texaco Ultra 10W-40 Semi Synthetic in it but this time I have decided to switch to fully synth for good, so it enjoyed 8 liters of Shell Helix Ultra 5W-40 fully synthetic.

Took the car for a nice run around 30 miles and it seems to have made a significant improvement. My MPG is up to 31 which I haven't seen for a long while and the car seems to feel a little smoother (not sure if this is psychological though!)...

Anyway whether its made a real difference or not its a joy to drive. But it might be cos's its Saturday, sunny and the roads were clear!

Like it! :bannana:

 

[Number_Cruncher]

>>Shell Helix Ultra 5W-40 fully synthetic

Yes, I use this oil too, the diesel version, and I'm very happy with it.

 

[shorty]

Im changing the oil in mine to morrow , gonna use Mobil 0 - 40 , im expecting to see a difference to

 

[Dieselman]

You always see a difference when changing oil, especially on a diesel, due to the thickening effect of pollutants in suspension.

You might notice the engine runs a bit cooler too.

Switching to synth is defiantly a good idea IMHO.

 

[phil c]

Just had the oil changed on my SClass this morning. Previously the car had Texaco Ultra 10W-40 Semi Synthetic in it but this time I have decided to switch to fully synth for good, so it enjoyed 8 liters of Shell Helix Ultra 5W-40 fully synthetic.

Took the car for a nice run around 30 miles and it seems to have made a significant improvement. My MPG is up to 31 which I haven't seen for a long while and the car seems to feel a little smoother (not sure if this is psychological though!)...

Anyway whether its made a real difference or not its a joy to drive. But it might be cos's its Saturday, sunny and the roads were clear!

Like it! :bannana:

we always use shell fully synthetic when servicing mercs , its not cheap but very good

 

[Dieselman]

Interesting read of oil capabilities and issues.

http://www.fordscorpio.co.uk/sythoil.htm

 

[shorty]

I changed the oil , oil filter and air filter last weekend and when I drove the car today I checked the mpg and I was pleased to see an improvement , up from 27 mpg to 30 mpg .

 

[C240Sport97]

I use Mobil 1 for 13 year old E230 .. it likes it, even if the engine still sounds a bit rough

 

[GuyFawkes]

Interesting read of oil capabilities and issues.

http://www.fordscorpio.co.uk/sythoil.htm

I've seen more science on shampoo adverts......

 

[stevesey]

I've seen more science on shampoo adverts......

If you want science go and read the technical papers on the subject e.g. and e.g.

 

[GuyFawkes]

If you want science go and read the technical papers on the subject e.g. and e.g.

I've got them, and not out of date ones like them....

 

[stevesey]

I've got them, and not out of date ones like them....

OK so you have the science - but why the comment about the lack of science in what is obviously just an useful informational article (with some references if people want to follow it up).

 

[spock500]

Interesting read of oil capabilities and issues.

http://www.fordscorpio.co.uk/sythoil.htm

More of an advert for Amsoil if you ask me, complete tosh spoken.

 

[GuyFawkes]

OK so you have the science - but why the comment about the lack of science in what is obviously just an useful informational article (with some references if people want to follow it up).

Because it was neither useful nor informational, it was mere promotional bull****.

Fully synthetic oils are actually worse for an engine under several non-rare sets of circumstances than mineral oils...

A fully synthetic 0W30 oil is actually 100% 0 weight oil, with (killable) additives to make it behave like 30 weight, and other additives because of the type of lubrication it provides.

A mineral 15W40 in the exact same motor will provide a thicker hydrodynamic film than the 0W30, and so it is more tolerant of impurities and imperfections in the bearing surfaces.

Because the 0W30 provides a thinner hydrodynamic film, it exhibits less friction (not always a desirable trait) and REQUIRES correspondingly reduced bearing surface imperfections and improved impurity filtration.

Nota Bene, a sharp lathe or mill tool generates least heat and least friction when it is cutting metal best.....

So fully synthetic is great for a run-in jap motorcycle engine built like a sewing machine.....

3 litre diesels.... trade bucket of 15W40 regularly changed with the best QUALITY (eg uniformity of hole sizes... not written on the box) filter you can get.

HTH

HTH etc.

 

[wemorgan]

Whilst a student I worked for two summers in a tribology lab. Most oils that we tested were taken from diesel buses. Rather than changing the oil at a fixed service interval or extended service intervals based on the ECU diagnostics, the oil was tested each month (viscosity & mass spectrometry). Based on the results a decisions was made when best to change the oil. I can not remember the brand of oil used, but I am quite sure it was a cheap generic oil, rather than a 'modern' low viscosity oil.

 

[spock500]

Sorry DM , didnt want to sound ungrateful for the link but those sites which have a 'forum' feel but with a hidden agenda bug me.

(It was tosh as well )

 

[stevesey]

Because it was neither useful nor informational, it was mere promotional bull****.

Fair point - I had my BS filter on high when I read it.

A fully synthetic 0W30 oil is actually 100% 0 weight oil, with (killable) additives to make it behave like 30 weight, and other additives because of the type of lubrication it provides.

A mineral 15W40 in the exact same motor will provide a thicker hydrodynamic film than the 0W30, and so it is more tolerant of impurities and imperfections in the bearing surfaces.

That's comparing apples and oranges (different weights) what would be interesting is some studies on comparable synth/semi/mineral oils.

 

[Dieselman]

(It was tosh as well )

Why exactly.?

It doesn't really bother me as it was just something I came across while searching for buckled wheels with reference to Killerhertz one. Ford Scorpio rims have a major problem with that, hence the scorpio search.
I realised it was an Amsoil perspective but it was about synthetics versus mineral oils.

 

[GCLTuning]

That's comparing apples and oranges (different weights) what would be interesting is some studies on comparable synth/semi/mineral oils.[/quote]


Correct it not in the same league

Regards *** Tuning

 

[Dieselman]

A fully synthetic 0W30 oil is actually 100% 0 weight oil, with (killable) additives to make it behave like 30 weight, and other additives because of the type of lubrication it provides.

A mineral 15W40 in the exact same motor will provide a thicker hydrodynamic film than the 0W30, and so it is more tolerant of impurities and imperfections in the bearing surfaces.

3 litre diesels.... trade bucket of 15W40 regularly changed with the best QUALITY (eg uniformity of hole sizes... not written on the box) filter you can get.

HTH.

Not really as you don't explain why.

All oils with a wide viscosity range use polymer additives which suffer more shearing the wider the range is, which is why it's better to stick to a narrower range than a super wide one, but as stevesky says you aren't comparing apples with apples.
Obviously a heavier weight oil has better protection under pressure, but that's not the issue here if the same weight oils are used.

I've always advocated using a 40 weight oil over a 30 weight one for reducing wear.

Something interests me though, why do manufacturers advise/specify synth/semi oils for their engines if mineral provide better protection.?

There is some school of thought that says a full flow filter isn't worth fitting at all due to the hole size being so large. Fiat didn't fit them at all for many years for that reason.

Has anyone ever checked the contents of their filter and actually found any bits in it.?