Royal Purple HMX 5W-20 High Mileage Motor Oil, 5 Quarts

I love royal purple it's been the best lubricant I've ever used been using it for about 20 or more years

After contemplating and reading reviews, I was interested and tried RP for the first time. I have an older 4 cylinder Chrysler engine (2012) which is a noisy engine. A benefit is that it operates noticeably quieter with RP compared with Mobil 1. When changing the oil it appeared that it held up better, it was less blackened and its viscosity held up. Other oils at time of changing were extremely thin. The oil dissipation was noticeably less - I didn't need to top off oil addition along its use. The engine system doesn't have any leaks, but of course we don't want any either. Thus I'm hoping that the additional lubricants in the High Mileage are helping protect all of the seals and gaskets as advertised. I rated the container 4/5. Its pouring characteristics are compromised by the 5 quart minimalistic bottle design.