Question for the oil gurus - I have 2 liters of ELF Excellium DID 5W-40 remaining. Can I mix ELF Solaris LSX 5W-30 with the DID without any compatibility issues? Oil change is for a 2005 Passat TDI. Before anyone says the Solaris is not 505.01 approved - the liter bottle on my desk says VW...
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