Use SAE 10w30.
The oil used in a slant six cylinder is typically 10w-30.
Changing the oil on a 1969 Plymouth Valiant with a Slant 6 engine typically requires about 5 quarts of oil, including the oil filter. It's important to check the owner's manual or consult a service guide for specific recommendations based on your engine's condition and any modifications. Always ensure you use the appropriate oil type for that era, usually a 10W-30 or similar weight.
under the oil filter pointed down or towards the block
If your replacing a slant 6 with another slant 6 it will bolt right in.
Ruptured Fuel pump diaphram?
It holds 5 qts. with a new filter.
For maybe 5 Minutes. Then, you'll blow it up.
I BELIEVE that is 4.5 quarts with engine oil filter change on the 1966 Ford Mustang STRAIGHT 6 cylinder engine
For the V-6, it takes 5W30.
a slant 6 does in fact have a timing chain but it rarely ever wear out, break, or stretch, because of the durability of a slant 6.
5w30
Total surface area: (pi*36)+(pi*6*12) = 339.292 square units rounded to 3 decimal places. That is assuming that you meant the slant length and not the slant height because otherwise you would need to use Pythagoras' theorem to find the slant length.