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I have used the M1 15-50 for years on the '93 1500 I just sold with 125,550 miles on it. I changed it with a filter every 3-5K and it did not burn one drop of oil when I sold it this past weekend. I am a firm beleiver of syn oil and I use the Mobil 1. That is not to say that the other syns are not just as good if not better.

I buy it at Walmart in the 5 quart containers for $26.00. O'Reilly gets $7.49 per quart.

Just my .05 cents worth

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