Why not run both, you ask? Well I am. R&P 5w30 plus a quart of HPL EC40 has been in my Jeep for around 1500 miles. I’m not really trying to solve any problems, no measurable consumption or issues. Just figured at over 100k, most of it probably on shelf oils save for my ownership period…might as well do a general cleanup. As I see it the products target two different areas. R&P seems to target pistons/ rings. The ester based HPL may be better at general varnish type cleanup. Will be back on Red Line for the next run but will pull a UOA on the cleanup cocktail and see how things are interacting.
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