Do not use 0W30 oil

I have tried using 0w30 full synthetic oil in my Audi A2 1.4 TDI. VERY BAD IDEA!. 0w30 oil seems much thinner(smaller oil particle?) and easily cause leeks.
 
The 0 in 0w30 refers to its cold viscosity. It means it’s runnier, so it’s potentially highlighted leaks that are already there, but unlikely to be the cause, unless you have been running it for years and as above, not the VAG standard for the engine.
 
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