When engine is hot, I see some oil Pressure fluctuations. When cold, oil Pressure is steady. Oil level is OK. Using a 0w30 oil with the easier style (longer) filter. Engine otherwise doesn't make any unusual noises or exhibit odd behaviors. I have an idea I'd a bunch of causes, but I could use a hand sorting as far as what's more or less likely. Come brainstorm with me 2005 tahoe 5.3LT, 140k mi Video of issue: Ideas: Sending unit. Was replaced 2 years ago but that doesn't mean much. Cracked pickup tube. I'd think this would cause more of a no pressure situation, no? Boinked pickup tube o ring. Maybe? High steady oil Pressure when cold that increases linearly with rpm. This issue only occurs when hot Worn or cavitating oil pump. I could see worn, oil pump having difficulties when the oil is warm and thinner. Cavitating would strike me as odd given this occurs across the rpm range Worn bearings in engine. Don't think that would be likely. Seems to be that would cause a continuous low pressure, not fluctuating. Bad oil pump bypass valve. Seems to me I'd have an issue when cold as well, no? Other ideas?