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    GC 0W-30 | '10 Impreza | 4.2-5.7k mi

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Quattro Pete</div><div class="ubbcode-body">TBN of 4.2 means there is still plenty of additive left. You can easily do 6K miles. To get the full picture, you also want TAN. When TAN starts exceeding TBN, it's time to...
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    FAQ - GC ( German Castrol )

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Quattro Pete</div><div class="ubbcode-body">Was it the latest "Made in Belgium" stuff? Your VOA shows lower levels of Calcium, Phosphorus, and Zinc compared to <a...
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    GC 0W-30 | '10 Impreza | 4.2-5.7k mi

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Quattro Pete</div><div class="ubbcode-body">Report looks fine to me. I don't think I've ever seen Silicon level of "0" on a UOA. You have suspiciously large number of zeros on this UOA...</div></div> I was thinking...
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    GC 0W-30 | '10 Impreza | 4.2-5.7k mi

    You're a wizard, Pete. Thanks!
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    GC 0W-30 | '10 Impreza | 4.2-5.7k mi

    I've been using 0W-30 GC since I bought my car 34k mi ago. Unfortunately, I've only been bothering with UOAs for the last year or so. For the most part I've been quite happy with GC, but the most recent test showed a suspiciously high particle count on both the used and virgin samples and the...
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    FAQ - GC ( German Castrol )

    I changed my engine oil this weekend, and for the first time I decided to run an analysis on a new/clean sample for my own curiosity and a baseline comparison. I've been running GC since I got my car 34k mi ago. I thought you guys here might be interested in the results. <span...
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