Sparks-IDI
Registered User
I don't know if any of you follow Dave's Auto on you tube, but I ran across this one in particular that was fascinating to listen to. A lot of the discussion revolves around diesels. When Lake Speed Jr. started to discuss keystone rings I really started to listen. Never understood their purpose or why they were even used. If you can, listen to the whole video. I found it very informative from a guy who knows motor oils.
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