My truck starts to rock at idle after 1000-1500 miles running it. It sucks. Only reason I put it back in os for easier cold starts since I was having an issue. Going back to delo 15-40 from Walmart next oil change. Runs so much better on that.
Interesting. I've ran it for last 50k miles being changed every 7k. I haven't noticed any issues but will pay attention to it.
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