I have read this thread over twice, just trying to get my head around it all... '06 BF 'phoon with 100,000+kms Last oil change was filled with magnatec 10w-40... possibly contemplating changing to a nulon 10w-40/50.. but so far I must admit I dont find a problem with the magnatec. I understand there is much debate throughout this thread, but in the fpv manual they recommend a mineral based 15w/40, so is going full synth a bad thing? oh and FYI, I change oil consistently between 5000-7500 klms, regardless of how good the oil is, it is just what I do. thanks for the help!