Customer Service Division c.c. Less friction in the engine will lead to lower oil pressure and more rpms at idle. The engine still has adequate oil circulation, but like the heart of a person whose blood pressure is lowered through medication, the engine doesn't have to work as hard for the end result. The change in idle speed is similar to the difference in the feeling of running through water versus running on dry land. You run more slowly in the water because the water resists your movement more than the air does.
Synthetic oils allow parts to move more quickly because they keep the level of friction lower.
Again, the engine doesn't have to work as hard for the end result. Everything your engine needs for lubrication and protection is in the oil. Additives can upset the oil's precise chemistry, or worse, interact with the oil in unpredictable and harmful ways. Skip the additives. Top of page Return to my Home page.