I was also a M1 person back in the days as well. I used it on everything. But when I noticed they changed the formula and my cars started to have start up noises, I switched to Amsoil and loved Amsoil. I was with them for years, till prices started to go up, and IMHO, wasn't worth the extra cost even though Amsoil was better than M1.
So I switched back to Penzoil Platinum and have been pleased. PP is better than M1 in their formulation and tests and it has made the car run quieter than any oil I have used. I recommend it over M1 no doubt, and if you don't want to purchase Amsoil, get PP which IMHO is good enough!
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SOLD: 2007 NISMO 350Z #0044 Silver Alloy
New DD: 2010 Titan Pro4X CC
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