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post #1 of 25 (permalink) Old 10th February 2007 Thread Starter
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Oil. Is it magic?

My 2.0 Lag I uses 15-40W semi synthetic
My GFs Clio uses 10-40W Semi synthetic
Halfords says that its ok to use 0-40W fully synthetic. in both. Are they saying that fully synthetic 0-40W give the same protection? How?
They also say that you get better economy. Anyone know how much? Is there a downside?
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post #2 of 25 (permalink) Old 10th February 2007
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Oil is a bit of a black art nowadays, All I know is the fully synthetic oil is better tho I think 0-40w is to low, I'm sure others with a greater knowledge than me will let us know. But people differ considerably on the use and type of oil .


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post #3 of 25 (permalink) Old 11th February 2007
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Hi there, the ratings you refer to are the viscosity ratings at either end of the temperature scale. For example, the lower the 'first' number is, the more 'liquid' it will remain at lower temperatures (vital in extreme temperatures with an engine with tight manufacturing tolerances). The higher the 'second' number is, the more resistant the oil is to hotter temperatures). You see, oil is blended from various grades (what used to be referred to as multi-grades), and due to a bit of chemistry, it was noted that mixing one with the other gave a lower freezing point and an increased boiling point than either had individually. Before then, cars used a 'summer grade - thicker oil ' and a 'winter grade - which was thinner'.

As far as synthetic vs semi-synthetic vs mineral oil , it is generally accepted that for longer service intervals or the use of a turbo or extreme driving conditions, then a synthetic gives better protection for longer (although, changing your oil more regularly than the manufacturer specifies does prolong engine life).

Using an oil which is rated above & below what your handbook states, will do no harm, however, if you were to use 10w-30w when you should use 10w-40w, then it may cause some problems.

It has to be said though, that in an emergency, I would put any oil in as a short-term measure than risk metal to metal contact!

Sorry for the long reply.


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post #4 of 25 (permalink) Old 11th February 2007
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I had my car serviced at a national chain garage. My car (non-Renault) is supposed to use 10w40 or 10w60. This chain used 0w40 fully synthetic. I wasn't too happy about it, but they insisted it wouldn't cause any problems.

Even though I was tempted to have it flushed out, I carried on using it until the next service (no I didn't go back to this gaarge because of other problems I had with their service). Luckily the oil did not give any problems, but I'm still not convinced that it was a good choice.
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post #5 of 25 (permalink) Old 11th February 2007
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I would always use the oil grade recommended by the manufacturer,although that can change as it did with the dCi engines....

Using the wrong oil can cause problems,ask any Ford Zetec,Vauxhall Ecotec or VW PD owner.

I'd rather push my Alfa than drive a BMW....
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