Richard,
Your post got my curiosity up. Last oil change 40 quarts 6k ago.... I went and checked my oil level. Still just above the full mark with no toad rust proofing. This I do know from the aircraft engine world....each engine would find its own level and stay there with many hours of operation. But fill it up and in short order you will have blown out the oil down to its own level.
Yeah well to complicate things there are at least two different oil pans for the 60 that I am aware of. My first coach definitely took 40 quarts, and never slobbered.
I use a quart ~1000 miles as well but I have a 8v92 oh and use Delo 100 as well.
Fascinating comment, Richard. So my slobber tube functions as an oil expulsion unit, especially when the unit is overfilled. I'm thinking my DD 6v92t should take 26-28 quarts with an oil and filter change.
We use Delo 100 40 weight, as instructed by Newell Gurus ! We order our oil at Orileys, and usually our order is ready in 2 days. I buy 3 cases at a time, each case being three 1 gallon containers. This gives me enough oil to prime the fresh oil filters, refill the " gentlemans" replacement oil resevoir , fill the crankcase to a bit below the full mark ( sweet spot on this coach) , and usually have an extra gallon to drag around for another 6 months. We seem to use 1.5 gallons going coast to coast, so I guess we are a tad over a quart every thousand miles.
I would gladly turn over the oil changes to Speedco or some other oil change company, if I could really trust them to put my Delo 100 40 wt in the engine. I have had the oil changed at local truck shops when I can watch. The 25,000 dollar penalty for low viscosity oil being run in these old engines is a risk that really scares me.
I have taken my own oil to Speedco because they do not carry 40wt single grade oil anymore.
The DD two stroke guys refer to the air box drains as " slobber tubes " , used to drain off excess fuel , etc at low rpm . These route into a catch can on the '86. We have checks that close off at about 3 psi so once the rpm rises the air box is sealed . The convoluted metal tubes that come down on either side of the bell housing are from the breathers on the valve covers . The breathers will vent oil overage . I went to larger diameter reinforced hose for the breathers , run into a 5 gallon pail (with lid ) with a couple of K&N filters . Very little oil ends up in the pail , probably overkill but I wanted the engine to breathe freely .
Chris
To follow up to my original post, I had the oil changed but the shop over filled it, putting in 7 gallons. I drained one gallon off, which left the oil dip stick showing about half way between low and full. We then drove 1300 miles during which the engine threw out almost no oil. It did use a little more than a quart. So, I've learned not to fill it up when changing or adding oil. My 6v92t takes about 6 1/2 gallons to reach the top mark on the dip stick but 6 gallons is what is really needed so as not to over fill. Thanks Gurus for the tip.