I have an 87 D100 slant 6 and im having some trouble finding the oil capacity. Also what are your thoughts on the preferred oil viscosity for this high mileage truck in a moderate climate like Ohio.

Thanks

 

i don't think what type of oil you put in you engine matters too much. i will run 5w30 in winter and 10w30 in summer. i'm not 100% sure but i would guess your oil pan would hold at least 4 Litres. you should just check the dip stip to and keep adding oil till it is where it is suppose to be.

 

Oil capacity is 5 qts with a filter change. 10w30 would be my recommendation.

 

YEP....

I've had a couple of Slant 6 motors over the years and like SEAL says, it takes 5 QT's like the big boys.
Of course, you could always fill up a couple of old 2 liter soda bottles if you wanna. LOL ... sorry Wolfie I couldn't resist.

 

SixGun its ok. i was not sure how much they held but when i buy oil for my 318 i always buy the 5L container so i usually have just enough to fill it.

 

On a different note, I wish the US would use the metric system. I have no idea how many feet are in a fathom. Prefixes are so simple.

Doesn't our truck(s) specify 10w-40?

 

i have never seen anything about using 10w40 in our truck but you can if you live where it is warm enough to run it or if your engine is dieing. you would definitely not want to run it during winter in Canada or you might kill your engine

 

To quote my original owners manual. 10w40 and 10w50 are not recommended for use in Dodge trucks. 10w30 covers our trucks from 0-100 degrees fahrenheit. There are 6 feet in a fathom. The reason we don't shift to the metric system is the unbelievable cost and pure stubbornness according to the Society of Automotive Engineers.

 

Hmmmmmm . . . I guess my memory is a little off. I remember putting in what was specified, but I also remember buying 10w-40 recently. I guess that was probably for my quad.

I know the cost would be hugely prohibitive to switch all at once, but I think small steps like making new production replacement speed limit signs read both km/h and mph would be nice. Then in 50 years, leave off the mph.

I can just imagine the can of worms the sudden confusion of having two numbers on a sign would open. "But officer, the sign said I can go anywhere between 55 and 90!"

 

I went and looked at my 91 owner's manual too and the two oil types it mentioned were 10W-30 and 5W-30. The difference being that the 5W-30 oil is recommended for locales were the air temperatures consistently fall below 32*F (freezing) to allow easier engine starting.

Way 2 Go Wolfie!