Good comments here, Engine flush almost cost us our slant 6. After draining the oil out there will still be deposits- all those deposits ended
in the bottom of the oil pan and we had to change oil about 3 times
to get it halfway straightned out, clogged 3 filters too! It sent all the
trash to the bottom of the pan and formed a thick sludge
stopping up the strainer and thus dropping the oil pressure down to the
danger zone- We had to drop the oil pan, clean the strainer, rechange the oil. But Id reccomend something like marvel if I wanted to flush an engine out, never had no problems there. There is no substitute for changing
oil on a timely basis! This car was owned by an old woman who never
drove the duster over about 55mph, this slant was full of sludge! Also
to anyone I reccomend gauges!! invaluable!! Alot of the times with
warning lights they tend to go off when it is to late...just my 2 pennies
worth.

What is needed is a gauge with a warning buzzer. Something I can hear over the radio.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2