How Important is oil spec for a wet timing belt?

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1
Location
Sheffield, UK
Hi guys,

I'm in the UK and own a 2017 Fiesta ST-Line Ecoboost 1.0 GTDI and have recently done my first oil change which was pretty rewarding but it came with first time jitters and paranoia (checking under the car and the dipsticks everyday for a week after lol). Around 3 months ago I just really had an overwhelming sense of really wanting to look after this car and for it to last as long as possible and became glued to BITOG!

Bear with me, but I'm just looking to maybe gather the opinion of some oil gurus...

This car should take 5w20 (WSS-M2948-B) and I thought to myself, does this spec really matter? It's been around for ages and it's quite annoying it's not listed as being superseded like many other Ford specs are. I've recently become paranoid about LSPI which WSS-M2C948-B oils haven't been clarified on whether they already tackle this problem (doubtful).

I went ahead and put in Mobil 1 AFE 0w20 (5w20 seems rare here in the UK) which seems pretty solid and meets all these:

Ford WSS-M2C947-B1
ILSAC GF-6A
FORD WSS-M2C962-A1
API SN PLUS

Yet again, the trend of paranoia continues (grab the tin foil hat for me would you guys ;-)) and I thought "crap, what if WSS-M2948-B has special soothing properties for the timing belt in oil system". So I drained that out and put some Shell Helix Ultra 5w20 in which does meet WSS-M2C948-B.

I actually dropped money on getting the details behind WSS-M2C948-B as it was bugging me and yes, there is an in-house belt in oil test. Looks like a belt is run in oil for 7 days at 150c and micro hardness, tensile strength, elongation and volume all must fall within a certain range. The only other things I can see that are making this spec so special is getting 0.7% better fuel economy (in-house test) over a specific reference oil.

So guys, what would you make of the belt stuff? I'd imagine all top rate oils would be fine, I can't imagine the Mobil 1 eating it to bits. As for the belt material, I think it's Hydrogenated Nitrile Rubber (HNBR) with some fibre glass cords in it.

Does anyone really think this spec is purely all based around fuel economy more than anything else and the belt in oil test is just nonsense and any oil would lubricate and not deteriorate it? I really just want a good LSPI preventing oil which I doubt any WSS-M2C948-B oil would.

Thanks for any help anyone can shed on this, go easy on me :)
 
Messages
998
Location
UK
Hi guys,

I'm in the UK and own a 2017 Fiesta ST-Line Ecoboost 1.0 GTDI and have recently done my first oil change which was pretty rewarding but it came with first time jitters and paranoia (checking under the car and the dipsticks everyday for a week after lol). Around 3 months ago I just really had an overwhelming sense of really wanting to look after this car and for it to last as long as possible and became glued to BITOG!

Bear with me, but I'm just looking to maybe gather the opinion of some oil gurus...

This car should take 5w20 (WSS-M2948-B) and I thought to myself, does this spec really matter? It's been around for ages and it's quite annoying it's not listed as being superseded like many other Ford specs are. I've recently become paranoid about LSPI which WSS-M2C948-B oils haven't been clarified on whether they already tackle this problem (doubtful).

I went ahead and put in Mobil 1 AFE 0w20 (5w20 seems rare here in the UK) which seems pretty solid and meets all these:

Ford WSS-M2C947-B1
ILSAC GF-6A
FORD WSS-M2C962-A1
API SN PLUS

Yet again, the trend of paranoia continues (grab the tin foil hat for me would you guys ;-)) and I thought "crap, what if WSS-M2948-B has special soothing properties for the timing belt in oil system". So I drained that out and put some Shell Helix Ultra 5w20 in which does meet WSS-M2C948-B.

I actually dropped money on getting the details behind WSS-M2C948-B as it was bugging me and yes, there is an in-house belt in oil test. Looks like a belt is run in oil for 7 days at 150c and micro hardness, tensile strength, elongation and volume all must fall within a certain range. The only other things I can see that are making this spec so special is getting 0.7% better fuel economy (in-house test) over a specific reference oil.

So guys, what would you make of the belt stuff? I'd imagine all top rate oils would be fine, I can't imagine the Mobil 1 eating it to bits. As for the belt material, I think it's Hydrogenated Nitrile Rubber (HNBR) with some fibre glass cords in it.

Does anyone really think this spec is purely all based around fuel economy more than anything else and the belt in oil test is just nonsense and any oil would lubricate and not deteriorate it? I really just want a good LSPI preventing oil which I doubt any WSS-M2C948-B oil would.

Thanks for any help anyone can shed on this, go easy on me :)
You appear to be worried about LSPI - do you have any evidence that the 1.0 EcoBoost suffers from this? I'm not aware that it does, hence no inclusion of LSPI in the 948-B spec, which is specifically for this engine.

Whilst the oil you have chosen is probably OK for this engine, I'll just point out that the 947-B and 962-A specifications are both built around API and ILSAC performance demands whereas the 948-B spec is built around ACEA as the EcoBoost engine is a European design. I assume your car is out of warranty now but this could play a role in any future 'goodwill' cover from Ford should anything go wrong.
 
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