OK guys, here's one for ya.
2014 Ram 1500
Bought used 4 years ago, 85K on it.
Ran Valvoline 5w20 for the first oil change, found this place and have run RL 5w30 and RP filters since. Every Blackstone report had come back as wonderful. I have posted a few reports here. Currently the truck has 125K, uses no oil between the 5k OCI.
So, why am I posting here? Oil pressure, or the recent lack of high oil pressure. Normal pressure at operating temp (200+ degrees) has been 46-48psi at idle, 55-58 doing 65mph (appx 1,500rpm). The last two weeks oil pressures have been dropping, 39 at idle, 44-46 at speed. Oil was 500 miles short of the 5K OCI, so I got some PUP 5w30 and both of the Purolator Boss filters (big and small). Did the oil change, the big Boss filter would NOT fit, so I used the small one.
Presto, oil pressure was back to normal. For about a week. Today, idle pressure dropped to 37, but "at speed" pressure was 55.
What the heck is going on? I'm waiting on the Blackstone report, and will post it when I get it. Engine makes no non-normal noises and is as quiet as normal.
Ideas?