My diesel holds 13qts, Went to Pepboys for an oil change in FL while I was down there working on my sister's house. The charged me $60 even after I bought 2 tires because it took 2.25 more oil than a regular car.Most of the ads in the mail for the quick lube places do state in fine print "excludes diesel vehicles" now,because they didn't previously,and owners of diesels that hold between 7 and 11 quarts were getting oil changes for like $19.95 !..(but I bet it wasn't diesel rated oil they got either!)..
The previous post reminds me I really should replace the air filter in my 6.2 GM powered pickup--it is the old fashioned round style,which maybe one parts store still stocks in town,and isn't cheap like they used to be..
I have used the air gun to blow it out a few times,and rotated it so a "new spot" faces the air inlet,it has only about 8000 miles on it,but it took me 16 years to go that far with it..the amount of air it has to filter is impressive,a V8 diesel inhales more air at idle than a wide open 4 barrel on an older gas engine !..I bet I'd notice an improvement in power and mpg by replacing it..