Castrol Formula RS 0W-40 - Mudguts
Does anyone have any experience using this oil?

I' m using Mobil 1 0W-40 in my 1997 Mondeo 2.0 SI at the moment but just wondered...

Castrol Formula RS 0W-40 - Blue {P}
I'm sure that someone will correct me but I thought if it had a Zetec engine under the bonnet then it should be ran on 5W30 oil, not a 40 grade, as these tend to damage the engine. I'm sure it was designed exclusively for 5W30. I know that the 0W40 oil is known to cause sticking valves in Escorts fitted with the Zetec engine.

I await correction eagerly! See what happens when I try to post in Technical Matters? :-)

Blue
Castrol Formula RS 0W-40 - Sooty Tailpipes
Yes, it should be 0w30 or 5w30, that is what I have always been led to believe.
This is because of the hydraulic valves.

0w40 would probably not cause any harm, ie not cause damage, but noone can really recommend it, its a case of "Use at your own risk"

I had a Mazda 626 with the Ford Probe engine which was not Zetec, but required 5w30 for the same reasons, I could not find a reasonably-priced 0w30 synthetic, so used Comma Syner Z 0w40 and never had any probs or ticking valves, so who knows?
Castrol Formula RS 0W-40 - Andrew Moorey (Tune-Up)
Agree with the 40 grade being too heavy but may not give problems as the synthetic oil always seems to be like maidenswater whatever the temperature!
Andrew


Simplicate and add lightness!
Castrol Formula RS 0W-40 - Mudguts
...I've got some Castrol Formula RS 0W-40 in one litre bottles and what I intend to do is drain my Mobil One about a thousand miles before the next service and use the RS as a 'flush' before putting Mobil One back into it next time...a bit of a waste of good oil but it was free.

I'm running the car 11K between services and last time I noticed that after the service (and oil change) it was a little smoother, so I expect that the Mobil One does deteriorate over time, I suppose I could actually change the oil a little earlier like after nine or ten thousand.

Castrol Formula RS 0W-40 - eMBe {P}
I agree with A Moorey's comment "the 40 grade being too heavy but may not give problems as the synthetic oil always seems to be like maidenswater whatever the temperature!" although I had never expectes to see the word "maidenswater" in a motoring forum.
I'm running the car 11K between services and last time I
noticed that after the service (and oil change) it was a
little smoother,


If you cannot get any more of your free Mobil1 supplies, remember that KwikFit do a Mobil1 oil (no capacity limit) + filter change for about £35.
Castrol Formula RS 0W-40 - jc
The Ford recommendation is 5W/30.
Castrol Formula RS 0W-40 - Vagelis
Oil grade depends on the average temprature of the area you drive the car in. Hydraulic valves require synthetic oil, but no special grade.

If you were living in a hot place (Greece for me) you wouldn't be able to use a 5w30 oil (we have 40C here in the summer, sometimes more!). So, you wouldn't buy a Ford with a Zetec engine? Or you would just use XXw40 or even XXw50? I see plenty of Ford Zetecs happily running around in Greece.

Have you noticed an oil-grade/temprature graph present on every car manual?

Vagelis.
Castrol Formula RS 0W-40 - Chas{P}
Vagelis

Ford reccomend 5W 30 for all markets including Greece.

Charles
Castrol Formula RS 0W-40 - Blue {P}
Unfortunately 40 degree days are a bit of a rarity in the UK! Otherwise I'm sure more people would run their Zetecs on 10W40, still not that I'd recommend it, afterall, once the engine has been running for 10 minutes the oil will be at the same temperature whether you're in the UK or in Greece. I'd rather stick with what is known not to cause problems personally...

What do the Ford dealers use in Greece? I would have thought they would still use the recommended 5W30...

Blue

 

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