My engine now has 170 hours since major gets 40psi on the oil pressure and overall runs great. That being said at the last annual (last month) we put in Phillips XC oil 20W50 weight. I flew this morning and when I checked the oil I noticed it was down to just over 3 quarts (7.2hrs since the change). I thought about it because the engine never seemed to use any oil at all. Anyway I flew it this morning for an hour and while tying down noticed a streak of oil coming up the top of the nose cowl and a fine mist of oil on the windshield. It looks like the front seal is leaking! I never had any noticeable leak before when I was using straight Aeroshell 100 (50wt). Since this is the first time I ever saw a leak like this and its also the first time I ever used multi-vis oil I can't help but think the two are connected.. I sure hope I don't need a new front seal..doesn't the case have to be split for that?! Any thoughts on this would be greatly appreciated..thanks

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