Over the past few weeks i've slowly been going through the filter changes on the g/f's Polo. Today was time for the oil & oil filter change as i knew it badly needed it. All that is left is the fuel filter change now.
Anywho, drained out the oil & what not. I'd read of mayo on the cap before, but had never actually seen it, so wondered what it looked like etc, wondered if i'd be able to spot it - if it was obvious or not kind of thing.
Took the filler cap off & there was no mistaking. The base of the cap was totally engulfed in a light brown/creamy sludge & then inside was loads of gunk also.
I wiped off the filler cap as best i could & wiped inside as best i could also. There was still some sludge left, but nothing compared to what it was.
G/f decided to tell me the car had been running a bit rough for a while (she likes to hold these nuggets of info back until something goes totally wrong or i spot something not right) but said she put it down to the cold weather. Possibly didn't help as mine's been sounding a bit rough in the colder mornings also.
Anywho, what would you guys reckon up the likely cause of this is?
I guess key info would be that the last time the car had an oil & filter change would've been hmmm ............ June/July 2008. She does short (5-6mile) journeys into town to get to work. Probably covers about 6000 miles a year, if that. Usually between 5-6k.
Is the likliest possibility just old oil in bad need of a change or what? Should i have really stuck some engine flush/cleaner in there?
As it is, i just change the oil & filter & that's that.