If you are blowing white smoke on start up, it could be your piston rings, valve guides, or valve guide seals. Valve cover gasket, especially towards the back also likes to leak, and would be hard to detect as it gows down the rear of the engine, bell housing and transmission.
Remote oil filters on many trucks can have fittings vibrate loose after many years of service. Start the vehicle, let it warm up, and do a slow deliberate, walk around inspection, looking for oil, smelling for burning oil, and anything out of the ordinary.
Non of this would suffice for a thorough inspection by either a mechanic or a learned friend. Keep an eye on your fluid levels, residue and build up around your exhaust is indicative of oil blow by from worn piton rings.
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