A friend of mine just got a vehicle, ex-rental with some engine sludge seen through the fill hole. Not hard sludge, but more of muddy look to it, not milky - we checked the coolant. Even if it needs a new engine - he still comes out under KBB value of the car.
Anyways, how about this scenario for a crankcase de-sludge procedure?
1) Drain the oil and put a Supertech oil filter on.
2) Fill the crankcase with proper capacity of ATF instead of oil (Supertech ATF is cheap enough to do this. Roughly the price of many engine flush additives anyways. But you get a gallon instead of a few oz.)
3) Run for 30 mins at 1500 RPM.
4) Drain the ATF and change the filter.
5) Fill with Castrol Magnatec 5w30 and oversized Fram Ultra for a 4k-5k OCI.
Anyways, how about this scenario for a crankcase de-sludge procedure?
1) Drain the oil and put a Supertech oil filter on.
2) Fill the crankcase with proper capacity of ATF instead of oil (Supertech ATF is cheap enough to do this. Roughly the price of many engine flush additives anyways. But you get a gallon instead of a few oz.)
3) Run for 30 mins at 1500 RPM.
4) Drain the ATF and change the filter.
5) Fill with Castrol Magnatec 5w30 and oversized Fram Ultra for a 4k-5k OCI.