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Lots of different flavor Kool-Aid to drink....
M1 0W-40 is a factory recommended oil
Walmart sell 5 quart jugs for around $25
I recently on the recommendation of people I know that track their cars and now use Motul 8100 Xcess 5W=40 It also is on the Porsche approved list It run=s around $125 for 20 LITERS on Amazon including shipping. That makes is just slightly more $ than M1. It definitely is better for the stress tracking puts on the engine than M1.
DT-40 is highly recommended on the forums by a specific engine builder and not on the approved list It is about double the $ than the others. Also DT-40 IS NOT recommended for track use
Running oil meant for Diesel engines is not recommended due the that additive package may not be good for our engines
Unless you are in sub freezing temps, 0W -40 has no advantage over 5W-40
Drink what ever kool-aid you like
YMMV
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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2004 Porsche Boxster S
2004 Porsche 996 Targa
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