|99 1.8 Confusion over acceptable oil grade to use? - jp147|
In my Ford Focus (UK) petrol owner's guide it says that 5w30 engine oil should be used at all times for optimum performance. However, further down the page below where it says engine oil top-up it says that 5w30, 10w40 or 5w40 oil can be used albeit with reduced fuel economy, performance etc. Does Ford mean that e.g. 10w40 can be used for a complete oil change (as it says "top-up" it doesn't say by what amount e.g. 1 litre or more) or only for topping up. Even more confusing, the Hayne's manual for this model says that 5w30, 10w40 or 5w40 can be used but higher viscosities e.g. 15w40 could cause damage. I have read in the car mechanics magazine that the use of higher viscositites than 5w30 can cause valve or other problems later on.
So I would like to know once and for all whether 10w40 oil would cause damage to the engine
Edited by Dynamic Dave on 06/03/2009 at 18:28
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