Oil change interval after internal work

[Rawze]

(03-31-2020 )tree98 Wrote:  Don't put that oil back in, oil is cheap just put fresh stuff in. You just did all that work and now you want to take the chance of running dirt and grit through your new bearings??

Unless the oil oil is already due to be changed, is jet-black, etc, or has gotten contaminated with coolant or something else, ... I will typically use the old oil and put it back in. - I do however filter it properly it as it goes back. - I then drive it to the nearest oil change place. Usually drive it about 50 miles or so to get it hot, then have it changed. It all depends on the circumstances. Nothing I have ever found wrong with using the old that comes out as long as it has not gotten contaminated, is not worn out yet, as it can be used to flush the the assy lube, brake cleaner and other residues, etc.

I would think that 300 miles would not make much difference vs, say 50 miles unless you used a lot of harsh chemicals. Just have to make darn sure your old oil has not gotten contaminated + proper filtration as it goes back in, etc. if you are going to re-use it.

The oil was already running in the engine,.. putting it into a clean container, then pumping it back in thru a filter medium should not make much difference if there was nothing wrong with it to begin with.


if unsure though,.. Like tree98 said,... oil is cheap compared to having problems ... get some new oil and change it again second time in a few hundred miles or less to flush the system out if you have no way to filter it properly or if you think it could be contaminated in any way. - Not flushing it out a second time can be bad for gaskets, etc... if a lot of brake cleaner and harsh chems were used during the repairs.