Used in my onan 4k generator on my toy hauler seemed to work well ran often over a week and a half no issues

Used in my onan 4k generator on my toy hauler seemed to work well ran often over a week and a half no issues  Read Less

I use rp in my 05 ram i change the oil every 15000 miles with no problems and its my daily and i haul my bike my quad and my bo...  Read More

I use rp in my 05 ram i change the oil every 15000 miles with no problems and its my daily and i haul my bike my quad and my boat and get 21 mpg  Read Less

We had to check it 10 times also we spilled about 8 onces on the ground and a small amount on the engine

We had to check it 10 times also we spilled about 8 onces on the ground and a small amount on the engine  Read Less

This is the duralec by royal purple not the picture shown

This is the duralec by royal purple not the picture shown  Read Less

I have since changed my mind about the value of this oil

I have since changed my mind about the value of this oil  Read Less

This stuff is awesome great price when purchasing in bulk

This stuff is awesome great price when purchasing in bulk  Read Less

Price is getting way to high going to have to find a brand that as good and less money

Price is getting way to high going to have to find a brand that as good and less money  Read Less

You get what you pay for it’s expensive

You get what you pay for it’s expensive  Read Less

I have used rp shell rotella t6 and valvoline syntech both semi and full synthetic valvoline premium blue and conventional deal...  Read More

I have used rp shell rotella t6 and valvoline syntech both semi and full synthetic valvoline premium blue and conventional dealership oil in my last 2 cummins  Read Less

I chose duralec for it because of the additives it has the mitsubishi v6 engines in them can be sensitive as regards the oils ...  Read More

I chose duralec for it because of the additives it has the mitsubishi v6 engines in them can be sensitive as regards the oils and the oil pressure because they run very hot especially in the summer  Read Less

I have ran other name brand oils and it failed test at 10 and 15000 miles

I have ran other name brand oils and it failed test at 10 and 15000 miles  Read Less

There is now the mobil delvac extreme full synthetic as well as shell rotella full synthetic both are 15w40 diesel oils

There is now the mobil delvac extreme full synthetic as well as shell rotella full synthetic both are 15w40 diesel oils  Read Less