Hi all,
Here comes a question that does not mean to stirr the pot. A lack of knowledge always provides excessive writing inspiration for me. Statement 1: None of the motor oils (neither dino nor synthetics contain any silicone additives). Statement 2: Engine seals get tired with time: contact with high temeperatue oil hardens the rubber. Statement 3: It is a good idea to use an oil "stop-a-leak" additive containing silicone for high mileage engines. Those additives would not hurt anything and would sooth, restore the rubber seals. I understand that modern motor oils are extremely sophisticated , well balanced mixtures. Mobil 1 15-50 (fully synthethic), that I just switched to, states that it features the "... SuperSyn anti-wear system... which helps extend engine life by reducing wear and oil breakdown". That probably translates into better lubricating abilities. How about those "rejuvenating effects"?
Thx.