okay so ive been noticing this now on my truck i just did the 2nd oil change on my truck, and well i know one quart goes to the filter when you start it up but when i turn it off and check the level its not at the Max. line its about half way there and when i drained my oil i only got bout 4 and 1/2 quarts out of it and i believe our motors take 6 qts right? It doesnt seem to burn oil and im sure it doesnt leak it. im stooped dont know what it is truck runs just fine.

 

The lifters could be holding on to some, the return passages in the head could be clogged or dirty, any number of things. According to the owners manual the 300 takes 5 quarts with the filter change.

 

run some seafoam through it, seafoam is wonderful at clearing our clogged oil passages.

 

I would run seafoam thru it but its a freshly rebuilt engine. I don't wanna harm anything

 

If its a fresh rebuild it's going to use a little oil till the rings fully seat.
Hope the valve job was done right. Guides can lose oil......

 

I hope so too I'm gonna keep a close eye on the oil level. The valve guides could lose oil? But it has good oil pressure or that had nothing to do with it.

 

What is the origin of your dipstick? (Be nice!)

 

All 300 six cylinders have a capacity of 6 quarts oil which includes that held by the standard oil filter.

I have owned 3 trucks with this engine and have found that when filled, the dip stick did not reflect the 6 quarts as being full. Next time you change the oil, park on even surface and make sure all oil has drained. I usually start with a warm engine, pull the drain plug and then grease the front end and u-joints and check tire air pressure. That gives plenty of time. Next remove the oil filter and replace with a new one with anti-drain back check valve [i.e. Motorcraft FL-1A]. Pour in 5 quarts of oil [let the oil containers drain well] and start the engine. Let it idle a few moments and check for leakage at the drain plug and filter. Shut the engine off and wait a few minutes to allow the oil to drain into the oil pan. Now, remove the dip stick and on the back side, using a very clean file, scratch a line where the true 5 quarts of oil leaves its mark. This will now be your truck's true "1 quart low" mark. BE SURE TO WIPE THE DIP STICK WELL, SO NO METAL FILINGS GET INTO THE ENGINE! Next, add the 6th quart and repeat the above process, marking the true "full" line on the back of the dip stick.

Now you have a calibrated dip stick.

 

Wow this is awesome I never really thought about it like that. I wish I woulda asked before I did the change non the less ill be doing next 3000.

 

+1 I agree!

 

Most of the 300s I've owned actually took a bit more than 5. My 72 took a little over 5 1/2 and my present 300 of unknown vintage does take 6 because I run the extra long filters.

 

i do run the 1 qt filters as well but when i would do the oil change on my truck i would be use to checking it and it would be at the max point but now when i check with 6qt its bout right in middle of add and max. Strange how that happens.