[sixto]

What oil did you drain then fill? I ask because we had a Caravan with sludge visible through the oil filler hole. I imagine the PO ran dino oil. A few changes with Mobil1 back when it was more synthetic than it is now cleared most of the sludge.

Did it look dirty on the dipstick as well on only while pouring and in the pan? Do you have an oil cooler that doesn’t drain through the pan?

Sixto
‘04 LE FWD 207K miles

 

[sixto]

Sounds like it’s a matter of how much you think about it Yes, a key point of changing oil is getting dirt and nastiness out of the engine so the more you remove the better. I wonder how much internal surface area that half quart of oil flows over on its way to the drain. I imagine not much. Maybe the compromi$e to avoid chemicals is a 200 mile flu$h with fre$h oil Or maintain a more reasonable drain interval than some oil manufacturer’s [crazy to me] 15k mile recommendation. I lose sleep if oil has been in the engine more than 5k miles. Thankfully I can afford to appease myself. There are people who lose sleep after 3K miles.

This is much better than the indirect injection Diesel days when fresh oil looked like what you just drained after a drive around the block.

Sixto
‘04 LE FWD 207K miles