Sludge

[Al]

I would use one quart Rislone, new filter, plus oil to top off. Check the 
dipstick for color change, apply to Kleenex or white paper towel. If it get 
real dirty before your mileage goal. Change all and do again.
>From Rislone site:
How much Rislone Engine Treatment do I install?
One bottle of 100QR Rislone Engine Treatment 1 quart (32 oz.) is designed to 
treat 4 to 6 quarts of oil, this allows you to replace a quart of motor oil 
at oil change time. You can also use it to “top off” your system between oil 
changes. Do NOT overfill. For larger systems, stationary engines and diesel 
trucks, use at 20% of engine oil capacity. For severely dirty engines, use 
two quarts of Rislone Engine Treatment and change the oil after 100 miles of 
driving.

Al
Honolulu