Two steps forward one step back...
Flushed, and refilled the oil on the trolley and popped a new filter in. Cleared enough mayo from the filler neck to make a round of sandwiches... clearly doesn't agree with GMs finest
, so treated it to Mobil1 to see if that produces less mayo... should do as a perished breather pipe was renewed about a month ago, so that wouldn't have helped any. That said, the oil and filter looked like they had been in there for four times the 7,500 miles they have actually done
Also changed the coolant and flushed the matrix. doesn't seem to have solved the heater temperature control though... either it's hot or cold... no middle ground.
Also sheared a cat to centre pipe bolt trying to resolve an irritating exhaust blow
so tomorrows job is to extract the remains of the old bolt and rearrange the clamping arrangement to sort it.