I had always had the fear of using Pennzoil because one of my good friends I used to work with, he tore down old engines. He showed me a car that only had used Pennzoil and the sludge build up on the valve covers. And then he showed me another engine about the same life that used a different oil and it was real clean except possible varnishing, if I may use that term.
I haven't used the PP line until now, I figured that it isn't the conventional oil, it should hopefully be better. That's my thought anyways.
I got my car in February 2006, it had 19K miles, I switched as soon as I could in March to M1. I have used M1 since then until my posting yesterday because of the scarcity of M1 on the shelves. I am at 68K+ miles now, and I had taken the filter to my work where we have oil filter cutters. I use the Filter-Mag as well, we opened it up, it was clean except for tiny particles where the magnet used to be. Most of my miles were freeway as I traveled to and from school. I was pretty impressed with how clean the filter looked for my driving I do, I can be hard on my car at times, especially accelerating on the freeway. I just hope that the Pennzoil helps out just as well.
My co-worker at work now, had told me of a lawsuit against M1 from the aviation community. I don't know all the details, but at one time M1 had promoted itself for use. I guess it wouldn't suspend dirt as good as say conventional 30W but I am not sure of that. Like I said, I don't know all the details, but there is a class action suit that was filed, it's on record, I'll look into it further, but M1 didn't do good for aviation engines.
See, unlike cars, airplane engines run harder than car engines do. Most of the time, the engine is running at 75% power, where as a car engine is running at probably 25-50% for highway driving. Unlike a plane engine with the propeller is consistently turning to keep that plane in the air, cars drop engine RPM for fuel economy and pollution laws. So my friend said that it is rare for synthetic engine oils to be used where the main oil used is 30-40W. Turbine engines do use synthetic oils though, don't get me wrong that they aren't used in the industry. Just the fact though that the general aviation community doesn't use them is what I am trying to express.
If someone knows more on that subject of the class action lawsuit or finds it before I do, that'd be interesting to know more. I have always wanted to research it since he told me, but I just didn't have the time, and well, now it's the holidays with some extra time off, I'll do my best.
