I would agree with Big Jim, as I have been using Mobil 1 since 1975, w/o any issues. Alot of this was in 4 cylinder Opels and VW's. Never any oil related problems.
Overkill; yes. I had a problem for the longest time moving from the 3k change intervals (oil & filter) to 5k. This is still too frequent for my type of driving (75 miles daily, freeway).
What's up with the "every 5 weeks" Jim? I was swayed by synthetic and it's extended change intervals, in part.
later - Bill
