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Royal Purple 20-820 no longer made?
Royal Purple customer service has gone downhill since the sale of the company to Calumet out of Illinois. I used to go directly to the facility in Porter Texas and purchase oil since 1996. But since Calumet took over, that is not allowed. They say go to O’Reilly’s Auto Parts. They rarely...- PowerOnly
- Post #33
- Forum: Engine & Performance
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Is anyone's oil NOT black immediately after an oil change?
Oil engineers at Royal Purple have told me that high detergent Diesel engine oil turns black from heat. Non-detergent oil turns brown from heat. I run Gulf Coast Filters 1 micron bypass oil filters on my 2020 Ram Cummins, 2001 Ford Powerstroke and a Series 60 Detroit in a Freightliner. Oil...- PowerOnly
- Post #20
- Forum: 5.9 Common Rail
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Oil change Percentage
I never change oil unless oil analysis recommends it. I use a Gulf Coast Filters 1 micron bypass oil filter set up. I have a 2001 7.3 Ford Powerstroke with over 360,000 miles with no oil changes since 30,000 miles. Engine has never been touched. I have a 2004 Freightliner Classic XL with 1.4...- PowerOnly
- Post #12
- Forum: General Discussions
