New Neighbor Said: "You're killing your engine"...thoughts?

[JFP in PA]

Originally Posted by anti-bling

I recently moved to southern california (woodland hills) and had to stop at my neighbors house when i saw he was cleaning his 996. Beautiful car...pristine.

We started into the typical "Porsche talk" and he asked what kind of engine oil i put in my car('97 2.5, 105k mi)...he said "its 0-40, right?" I said "no, i just changed the oil and put in mobil 1 10-40, high mileage". He then proceeded to tell me that, not only was i robbing myself of horsepower (not a big deal to me...not at price of longevity), but i was going to eventually make it seize as the viscosity is too thick.

Sounds a bit extreme to me. I would think that 10 weight oil, being a little thicker, would give better protection and stick to gears longer...and i know a few of you are using it. Am i wrong? I'd hate to have to change my oil again, as i did it yesterday, but if i need to, i will.

Please, any thoughts?

If there is anything "too thick" here, it is your neighbor........................