How long do these I6's last

[Speedjester]

Since it just startedafter this oil change..I don't know the type of oil filter used.. But some have anti drain back valves.... Keeping the oil filter and pump primed for when you start it.. They usually get the oil flowing quicker.... If there is no anti drain valve it might take longer to build up pressure....

Good luck

[slick4x4]

Or...... Maybe the old sender is just getting a bit 'slow' to respond

[Toyz]

I would think the presence of "clicking" would indicate that it is not likely the sender. Wear may cause the pump to lose it's prime, coupled with overall clearances becoming looser. Speedjester is correct, a filter with the original anti-drainback valve may help, although it is not likely to totally correct the problem. These engines are known for longevity; the weak part IMO, is the original fiber cam gear. It is pretty durable considering the material of construction, but these trucks are approaching 50 years of age, so it often deteriorates. Quite often those same materials then enter a comfy relationship with the oil pump screen, which is especially a problem when the oil is cold and thus thicker. Since you are in a temperate area, if you are running a light viscosity oil, might step up a grade, although if I am right about the screen, it may make matters worse.
Paul

[Toyz]

Personally; I dislike Fram filters. This goes way back, and I'm not even certain if my reasoning, whatever it was, is still relevant. I run Mobil One filters on my non-Fords, and on applications where I can't readily obtain Motorcraft. I really have no concrete knowledge to support those choices, and suspect I could save a little money by eliminating the Mobil One choices.
If you have no reason to suspect screen clogging, and I would not, if the engine has been maintained, then a quality filter and a higher viscosity may be helpful, (or not). Without further knowledge of the quality of the rebuild, it may well be just wear due to use of budget parts. It may well be worth replacing the oil pump if you find that operating pressure is also sub-prime. There are additives which are professed to lessen the cold start situation, I'm not much of an engine additive person, so I can't help along that line.
It may be worth investing in a pressure gauge if you don't have one handy, just to ascertain that you have at least 10 psi or better under normal running conditions.
Paul

[unibody madness]

I would start with the replacement of the oil filter.
A high quality filter, not often used as promotional incentive, might be all you need.
Oil additives might help as well.

[Leeroy]

Ive had this very problem you describe on the mustang (289) with tappet noise and oil light. Its the original engine that had been rebuilt before it left the USA, but really is an unknown as to how long ago.
I too ran 10w40 since I'd owned it (coming up 10 years) and I found last summer it would take a little longer for the oil light to go out. Oil consumption was never an issue although I found I did need to add at least 1/2 quart maybe a full quart between services. I swapped to a 20w50 zdtp oil and it mostly went away. Don't add any oil between services but I do still get some tappet noise, moreso over winter.

I'd up the oil first + filter as mentioned above. It's the cheapest option really!

[ras4434]

The 300 I6 in my 66 had over 649,000 when the truck rusted out. The motor was pulled and put into a van that goes up and down I-5 (Oregon) between Portland and Eugene. There was no major work done to it during the time I had it. Many times I wish I still had the motor.

[William-in-St George]

WIX oil filter and 20-50. I like Delvac for diesel engines available at Walmart. With clean oil and regular service these engines are easily capable of way over 100K miles.

[Truckrat]

Doc, with mileage over 600K I would suspect that engine saw a bunch of highway miles
on a daily basis. Like maybe a 50 - 100 mile commute each way daily.
A friend of mine commutes about 50 miles each way Monday thru Friday in his Dodge pickup
with a V6 in it and has over 400K on the clock already. And it is a 2009 or 2010 model.
Your 240 should last way past 100K I am thinking. Oil pumps are cheap insurance
and I would bet easy to change under your truck. Melling pumps always worked good
for me. I have a 300 I want to build up for a 64 Slick and will get busy with it after
My 57 is back on the road. Good luck with yours. TR