I read recently, on a trade advice manual [online] that it was deemed inadvisable to go squirting WD-40 around any components in contact with petrol [with ethanol mixed in]?
On the assumption the WD-40 mentioned would be the original stuff, how accurate is the above assertion. please?
I am not sure why you would want to add WD40 to petrol, E10 or not. I researched the issue you menition and found nothing to suggest this would cause a problem. I have even run some tests:
In both cases there appeared to be no "ill effects".
Perhaps the following articles on WD40 are of interest: