First off, I run Mobil 1 in everything I own. Great stuff, and the additive package makes it act almost like dino oil in terms of keeping the seals swollen (and keeping oil from leaking out).

However, that's a big almost. My 300TE was 7 years old when I switched to Mobil 1 (15W50 summer/10W30 Winter) and it sprung leaks everywhere. Since I'm keeping it forever I was okay with that. I was more successful with my 500E; no leaks since changeover 25k mi ago (at 45k/6yrs old).

Good luck !

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Best regards, Michael
'92 500E
'88 300TE