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    Where to buy Pennzoil Ultra 5W40

    Its listed on Pennzoil's site, but can't find it. I checked Nextag, amazon.com, a few other auto parts stores, and can't find it. I did find like 5W30, but even that seems to not be that commonly available. In general, what's some of the best places to get oil online at a discount?
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    viscocity improvers

    I was just looking at the thread comparing 10W30 to 5W30 conventional, and that the 5W30 would need more viscocity improvers. Which reminds of of similar issues. I remember being told, years ago, that you shouldn't use oils like a 10W50 as they would have to have so much additives to get such a...
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    Mobil 1 fans?

    There's a ton of Mobil 1 related threads. If I search for Mobil 1, I get lots of hits. So, I'm sure this thread is redundant, but I didn't see specifically what I was looking for. Anyway, I've noticed that there seems to be a lot of Mobil 1 fans here. I thought that I heard that Mobil 1 stopped...
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    European car formulas

    I've seen some vendors selling what they call European car formulas, like 5W40 or maybe 0W40. Just curious, what kinds of cars actually call for this? A lot of people with my car, the Mazdaspeed 3, are recommending this type of viscocity, it has to do with the turbo. My general understanding is...
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    Greddy synthetic

    Anybody have an experience or comments on Greddy's synthethic?
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    Did I screw up with SynLube?

    I'm new here. I see a topic on SynLube as being locked. I hope it is okay to start a different thread on it. I'm not here to sell it, just to tell my story and ask for opinions. I bought a medium performance turbo car, a Mazdaspeed 3. Most people would be anxious to change oil often. I figured...
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