Wrong Oil Help
12-11-2011, 06:07 PM
#1
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Wrong Oil Help
My brother has topped up the oil on his St Mondeo from the min mark to full with the wrong oil 
Will it be ok or will it do the engine some damage?
Will it be ok or will it do the engine some damage?
12-11-2011, 06:28 PM
#3
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It's just he didn't know if the oil would be thicker and the pump wouldn't like it.
I thought it would be ok though, just wanted someone else to say so to.
I thought it would be ok though, just wanted someone else to say so to.
12-11-2011, 07:32 PM
#6
It should be ok, what he has at the moment will be thinner when hot (This is what the second number denotes, so 40 in this case) however I would personally change with the correct 5/30W reccomendation. Personally if it was that low I would have done a change anyway, it's also worrying how it was on minimum in the first place!
Martin
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12-11-2011, 07:54 PM
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i would personally change it as my brother bought wrong oil for his oil change and that was 10w 40 and its stopped buckets working properly and eventually jammed buckets and ended up needing new engine
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12-11-2011, 08:59 PM
#12
I have a similar "arguement" day in day out with people..... They ask me for oil for their car and I then get asked "anything cheaper"..... I tell them the right oil is xxxxx after that you can put what you like in but on your head be it.....
Steve
Steve
12-11-2011, 09:02 PM
#13
As engines get older the tolerances inside them get looser, and often its a good idea to move to a slightly thicker oil. So his 6w32 in there now is probably perfect!
It will be fine providing the oils arent actually incompatible chemically like if it was castrol R40 or something like that.
It will be fine providing the oils arent actually incompatible chemically like if it was castrol R40 or something like that.
13-11-2011, 10:02 AM
#23
PassionFord Post Whore!!
Right or wrong grade or type of oil,
If it was on minimum when he topped it up it won't be too long before it's gone and needs topping again, unless he's never topped it up
.
If it was on minimum when he topped it up it won't be too long before it's gone and needs topping again, unless he's never topped it up
.
13-11-2011, 10:06 AM
#24
PassionFord Post Whore!!
Ask some of the thousands of VAG 1.8Turbo engine owners that have lost an engine because of using something other than VAG approved synthetic, if the correct oil is important.
13-11-2011, 01:18 PM
#25
In heat-proof for example.
Never said that. I'm only willing to give oil tips, why not?
And a 5W-30 mixed with 10W-40 is crap for me, even for refill.
But if ppl want to maltreat their engines with crap oil, go ahead!
And a 5W-30 mixed with 10W-40 is crap for me, even for refill.
But if ppl want to maltreat their engines with crap oil, go ahead!
Last edited by Cossiemainful; 13-11-2011 at 01:19 PM.
13-11-2011, 01:23 PM
#26
What are you on about?
His particular brand of 5w30 or 10w40 could be an estersynythetic capable of taking 160 degrees of heat for all you know.
The grade of the oil isnt its heat rating, its the viscosity (thickness) thats all.
You can get 10w40 oil that takes massive heat, and others that cant cope with heat at all well, but they still have the same thickness.
People actually deliberately blend oils to get to a viscosity they want for certain uses, include the oil companies in the first place, so I dont see how the fact its got two grades of oil in now somehow makes it "crap oil" what do you mean? Crap in what way?
His particular brand of 5w30 or 10w40 could be an estersynythetic capable of taking 160 degrees of heat for all you know.
The grade of the oil isnt its heat rating, its the viscosity (thickness) thats all.
You can get 10w40 oil that takes massive heat, and others that cant cope with heat at all well, but they still have the same thickness.
And a 5W-30 mixed with 10W-40 is crap for me, even for refill.
But if ppl want to maltreat their engines with crap oil, go ahead!
But if ppl want to maltreat their engines with crap oil, go ahead!
13-11-2011, 01:42 PM
#28
So a 10W40 mineral would be thicker hot than a 5w30 synthetic if you were going to make the assumption that the 10w40 he has used was mineral like you seem to want to and that the 5w30 was a synthetic.
So it wont be "hot too thin" at all, in fact if will be thicker.
In reality though its very rare to see anyone selling straight mineral oil at all these days in 10w40, thats a grade you tend to find is normally semisynth if anything, but it could potentially be anything upto and including the latest ester synthetic.
In one of our trackdays cars for example I run 15W50 Motul 300V for example, thats a good quality fully synthetic oil ( Double Ester in fact) with a great additive pack and fantastic tolerance to high temperatures without breaking down, and yet you would dismiss its quality on ground of the thickness?
I really think you have completely misunderstood what the numbers actually mean, they tell you nothing at all about if its a mineral or a synthetic.
Last edited by Chip; 13-11-2011 at 01:44 PM.
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