Personally,
I'll stick to what ford say, after all they've been building engines for long enough.

 

The 1.6 ecoboost should be using 5w30 anyway, its the 1.0 that has 5w20 recommended. In all honesty given the 20+ years of development in this engine, Id agree with ST3spin. It will create more friction being thicker...

 

The 1.6 ecoboost should be using 5w30 anyway, its the 1.0 that has 5w20 recommended. In all honesty given the 20+ years of development in this engine, Id agree with ST3spin. It will create more friction being thicker...

Every service ive had has been 5w20.

I know they reccomend that but then what if your car is tuned anyway?

 

I assure you its 5w30, thats what goes in at the factory. Castrol would confirm that.

 

I assure you its 5w30, thats what goes in at the factory. Castrol would confirm that.

I assure you this is not correct. If it was why would 3 different ford dealers put 5w20 in my car.

 

@Stdriver65 5W20 is USDM only, should be 5W30 in the UK.

 

@Stdriver65 5W20 is USDM only, should be 5W30 in the UK.

Well thats bloody annoying then, stoneacre york put 5w20 in my car on an interim oil change!

 

I assure you this is not correct. If it was why would 3 different ford dealers put 5w20 in my car.

Ive already explained this. 5w30 is 1.6. 5w20 is for the 1.0. Im an engineer for Ford Motor Company at the plant your engine was built, trust me I assure you I am not wrong.

Yes as quoted earlier US engines used 5w20.

You can put whatever you want in mate, but trust me Ford DEALERS get it wrong quite often. Personally 5w40 will be fine, just dont expect the same mpg etc, I actually still think fully synthetic Mobil 1 0w40/0w30 is far superior.

 

Ive already explained this. 5w30 is 1.6. 5w20 is for the 1.0. Im an engineer for Ford Motor Company at the plant your engine was built, trust me I assure you I am not wrong.

Yes as quoted earlier US engines used 5w20.

You can put whatever you want in mate, but trust me Ford DEALERS get it wrong quite often. Personally 5w40 will be fine, just dont expect the same mpg etc, I actually still think fully synthetic Mobil 1 0w40/0w30 is far superior.

Sorry mate its just because a ford dealer put 5w20 in my car and i assume they know what they are supposed to be using. I guess not.

Im tempted by the 5w40 as the car gets driven hard and im thinking the 5w30 is probably for people who drive the car sedately etc.

Would it have caused any lasting damage using 5w20?

The thing is if you put the reg in eurocarparts and so on, 5w20 oils all come up, and on the castrol leaflet for ford it says 5w20

 

STdriver65
Told ya... :grin:

Sorry, the little fellow on my shoulder made me put that. :ninja:

 

personally i stick with 5w30, mainly because i have a MK6 and MK7 and can use the same in both. Never really bothered to look into what the numbers mean, just stuck with what the manual says.

This has a little bit about the what the numbers mean : https://www.micksgarage.com/blog/understanding-engine-oil

 

👹😂 no worries mate, unfortunately not running dealers down but the information they are given isnt always correct. 5w40 isnt going to kill it in all honesty, frequency of oil changes are more vital if Im going to be really frank. I halve the quoted 12,500 interval & my car gets ragged & is mapped. It runs superb on Castrol 5w30. As long as its synthetic & of decent quality it should be good. I wouldnt recommend higher than 5w (ie 10w etc) as the windows are there for operating tong tolerances, Id consider 0w though as there is nothing I can immediately to rule this out. 👍
Btw even ford know STs rarely get driven sedately 😂👍

 

Ive already explained this. 5w30 is 1.6. 5w20 is for the 1.0. Im an engineer for Ford Motor Company at the plant your engine was built, trust me I assure you I am not wrong.

Yes as quoted earlier US engines used 5w20.

You can put whatever you want in mate, but trust me Ford DEALERS get it wrong quite often. Personally 5w40 will be fine, just dont expect the same mpg etc, I actually still think fully synthetic Mobil 1 0w40/0w30 is far superior.

I'm sure I remember you stating a couple of times it was Castrol Magnatec 5w20 which was used in the engine plant?

 

Found it:

https://www.fiestastoc.com/forums/topic/203786-what-oil-does-ford-use/?p=2887546

https://www.fiestastoc.com/forums/topic/203786-what-oil-does-ford-use/?p=2886818

 

Found it:

https://www.fiestastoc.com/forums/topic/203786-what-oil-does-ford-use/?p=2887546

https://www.fiestastoc.com/forums/topic/203786-what-oil-does-ford-use/?p=2886818

Haha talk about contradicting himself.

 

You're contradicting yourself here...

The 1.6 ecoboost should be using 5w30 anyway, its the 1.0 that has 5w20 recommended...

I assure you its 5w30, thats what goes in at the factory. Castrol would confirm that.

Ive already explained this. 5w30 is 1.6. 5w20 is for the 1.0. Im an engineer for Ford Motor Company at the plant your engine was built, trust me I assure you I am not wrong...

I say this because previously you have said the factory uses 5w20?...

Mangatec 5w20 from the factory, trust me I work there

The 5w20 is much more expensive. I work with the castrol blokes every day & trust me they want to make more money, I mean ensure better running, higher performance & economy every day. I'm not here to make up things. The engine plant uses 5w20 & a tiny percentage of UV reactive dye to check for leaks. Up to you guys, but that's fact & ive worked there for 19 years in case you doubt my credentials.

So, which is it? Have they changed from 5w20 to 5w30 since 2015?

 

Haha talk about contradicting himself.

Well it was a couple of years ago, maybe he was initially given the wrong info.

Apart from one mid service oil change where I used 5w30 I've been using Magnatec 5w20 for past 3 years and 34k miles, my oil is changed every 5k miles.

Looks like I'll be changing to 5w30.

 

This is a post I put up from time to time when this subject comes up...

You just need to make sure it conforms to the correct specifications, which are listed within this post that I've put up a few times previously...

You will never get a consensus of opinion on what oil to use on this, or any other, forum. The topic has been discussed many, many times and the threads always go the same way.

Some people (including some who work for Ford) say that the Mk7 ST has 5w30 put in it at the factory...

5w30 is what these engines have from factory and what ford dealers use, i work for ford and thats what we use

If it should have 5w20 in it,why does it come from the factory with 5w30 in it.
1L EcoBoost comes with 5w20 oil in it.
1.6 EcoBoost comes with 5w30 oil in it.

Others who work at a Ford Factory state that it comes with 5w20...

The 5w20 is much more expensive. I work with the castrol blokes every day & trust me they want to make more money, I mean ensure better running, higher performance & economy every day. I'm not here to make up things. The engine plant uses 5w20 & a tiny percentage of UV reactive dye to check for leaks. Up to you guys, but that's fact & ive worked there for 19 years in case you doubt my credentials.

People who have checked ETIS say it can use either...

I checked this on ETIS at work during the week, using the VIN of my car. It can use both. The spec sheet lists 5w-20 (WSS-M2C948-B) as recommended, 5w-30 (WSS-M2C913-C) as an alternative. My owners manual also states the same.

This appears to be backed up by Mountune (via a Ford Service Bulletin they have), although they use 5w20 when they service them...

We use 5w20 on all Fiesta ST Mk7 services, 5w20 and 5w30 are a directly compatible oil and therefore you can use either - there is a Ford Service Bulletin to confirm this.

Some people say their manual (mine included) states that 5w20 is the first choice oil with 5w30 listed as an alternative. This is confirmed here, although it is more specific by naming Castrol or Ford oil as the suggested brands...

Furthermore, it goes on to say...

"If you are unable to find an oil that meets the specification defined by WSS-M2C913-C or WSS-M2C948-B (gasoline engines only), you must use SAE 5W-30 that meets the specification defined by ACES A5/B5."

If you want to know more about the "A" numbers and oil in general, take a look here...

https://wiki.seloc.org/a/Oil_Labelling_Explained

Some people are even more specific and state it should be Castrol Magnatec Professional.

Others have said their manual only states 5w20 is to be used...

...I'm still skeptical as to why there is this change to 5w-30. The manual states 5w20.

Some dealers use 5w30 (including mine who are Jacksons Ford of Henley), whilst other dealers use 5w20.

Some say that 5w30 is being used instead of 5w20 because it makes the engine quieter, others state it is used purely to save money.

Others use different brands that have the correct specification such as Millers or Shell Helix.

Basically, you need to decide which oil you are happy using. It has to be assumed that either 5w20 or 5w30 is acceptable, otherwise dealers all over the country would be at risk of invalidating warranties and leaving themselves open to litigation. Whether one oil is better than the other for the engine is open to debate and personal opinion and, like the tuning debate, there will never be a consensus of opinion.

I have 5w30 in mine, I trust Jacksons Ford of Henley and if it's good enough for them, it's good enough for me. :nice:

 

As per boSTin with regards to the info in the users manual, i personally default to 5w30.

Just to confuse matters, has anyone caught any of the various threads around the internet or comments under You tube videos ( search fiesta ST rattly engines) where Ford dealers have been advised by Ford to use 0w40 ( RS focus spec) to quieten down ST engine rattle?

 

@The Layer Cake

Any comment regarding which oil is put in at the factory?

You're contradicting yourself here...

The 1.6 ecoboost should be using 5w30 anyway, its the 1.0 that has 5w20 recommended...

I assure you its 5w30, thats what goes in at the factory. Castrol would confirm that.

Ive already explained this. 5w30 is 1.6. 5w20 is for the 1.0. Im an engineer for Ford Motor Company at the plant your engine was built, trust me I assure you I am not wrong...

I say this because previously you have said the factory uses 5w20?...

Mangatec 5w20 from the factory, trust me I work there

The 5w20 is much more expensive. I work with the castrol blokes every day & trust me they want to make more money, I mean ensure better running, higher performance & economy every day. I'm not here to make up things. The engine plant uses 5w20 & a tiny percentage of UV reactive dye to check for leaks. Up to you guys, but that's fact & ive worked there for 19 years in case you doubt my credentials.

So, which is it? Have they changed from 5w20 to 5w30 since 2015?

 

@The Layer Cake

You've visited the forum numerous times since the above post (including today), are you really not going to clarify the contradiction in your advice regarding the oil put in at the factory?

Your reluctance to reply doesn't do much for your credibility, especially when you always tell people to trust you as you work there.

 

Sorry gents I shouldve answered this ages ago but honestly just havent got round to it.

Yes originally the recommended oil viscosity for the 1.6 GTDI was 5w20, identical to the 1.0 Fox engine. However it was later changed (cant remember the exact date but approximately 2 years ago) to 5w30, due to NVH concerns.

The 1.6 is an aluminium block with bore liners but the 1.0 is a fully steel block, so the 1.0 can afford to run the 5w20 oil with less of an NVH trade off, as opposed to the naturally more sonorous nature of the 1.6 block.

Hope this clears up things & I do apologise for any misunderstandings I may have caused. The previous information was correct at the time & it should also be noted that a number of garages still seem unaware that the change even took place. I know my local dealership didnt have a clue (not much of a surprise there though....!).

 

Sorry gents I shouldve answered this ages ago but honestly just havent got round to it.
Yes originally the recommended oil viscosity for the 1.6 GTDI was 5w20, identical to the 1.0 Fox engine. However it was later changed (cant remember the exact date but approximately 2 years ago) to 5w30, due to NVH concerns.
The 1.6 is an aluminium block with bore liners but the 1.0 is a fully steel block, so the 1.0 can afford to run the 5w20 oil with less of an NVH trade off, as opposed to the naturally more sonorous nature of the 1.6 block.
Hope this clears up things & I do apologise for any misunderstandings I may have caused. The previous information was correct at the time & it should also be noted that a number of garages still seem unaware that the change even took place. I know my local dealership didnt have a clue (not much of a surprise there though....!).

I'm not surprised, you've known for approximately 2 years but didn't mention it on here, so it's not really a surprise that information doesn't get passed on by Ford in an efficient manner.

Thanks for clearing it up now though :nice:

 

May I ask what "NVH" means?? Not understanding what it refers to.

 

May I ask what "NVH" means?? Not understanding what it refers to.

Noise, Vibration, Harshness :thumbsup: