Oil weight discussions pail in comparison to ZDDP content in your oil. Your required reading lesson is this, read the engine oil thread on this forum, then report back to us what oil you will be running. we can TELL you but if you read it, you will understand so much more about oil than you thought you ever would, good luck/

Among the choices for M1, my vote would be not to use the 0W-40 in this car in preference to the 15W-50 (even though I use that oil exclusively in my Saab 9-5 Aero and it's the factory recommended oil for modern Porsches). First of all, from all I've read no manufacturer requires single-digit viscosity numbers until it gets seriously cold - well below freezing for weeks on end. The low temps you and I encounter during the winter are actually pretty wimpy compared to what others put up with in other parts of the country, as well as in Europe where these cars were manufactured. For example, the owner's manual for our cars cautions to not use 20W-50 "at constant temperatures below +5 degrees F". That's pretty cold and that's 20 wt. they're talking about.

But the main reason is that M1 0W-40 has less zinc and phosphorous:
Phosphorus - 1000 PPM
Zinc - 1100
Now, those aren't bad numbers, but still. If you get a little more in 15W-50 for the same money, I'd take it! It's supposed to make a difference, and it's the recommendation from Mobil themselves for "flat tappet" applications (that's us).

I've decided to go with an old $3.99 case of Pennzoil I found in the back of a Circle K. I'll be reporting back within the next 5000-15000 miles on it's much expected performance qualities. Something tells me this is the stuff. Sean Pitt (Brad Penn?) motor oils look out.

I'd go to a good tint shop (a place with references). I do all my work myself, but I stay away from tinting or tint removing. It is one of those skilled jobs that benefit a lot from practice and the right tricks / materials.

Another thought is that you may need a new rubber seal in the rear window earlier than later. If this is the case, you may want to remove the tint while the window is out. This would be a very good time.

Indeed, IIRC the heater element is bonded on from the inside. They are metal traces, not round wires, but you will not be able to go at it with a blade / spatula without possibly hurting these.

George

Removing tint
 

I followed the instructions on this page for removing the tint on my 928. Around the defroster wires I used a plastic scraper like an old credit card on a hot day with plenty of Windex on it. If it is sticking too well on a wire, spray and soak until it softens.
http://www.tintdude.com/remove.html