I'm no oil expert but I will echo the other reply, I would have no worries mixing the two.
I'll expand on that by saying I would have no hesitation mixing two oils I would run on their own already. So if you would run either one of those oils anyways, then I say go for it.
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2001 Base 2.7l, 5-speed (124k) - LN IMS kit
- TopSpeedAuto exhaust (headers/mid/muffler)
- 997 Carrera III wheels w/ECS spacers 18x8 +15mm/18x10 +18mm, Eibach springs
- FunctionFirst shift knob/short shift kit
- Focal speakers/Alpine amp/Kenwood deck/Pioneer 8" subs
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