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Sounds like an alloytec that's not been serviced. Awaiting the picture but I'm going to assume you'll find caked rocker covers , cam caps and a blocked drivers side breather.
Which will usually result to a timing chain failure in the end because the tensioners not positioned correctly due to low oil pressure and a blocked feed hole.
I can't upload pics sorry yes your right caked everywhere. Wats the best way to clean itI just got off gum tree got it home put it in. Took oil filter out to find this build up slug in it. Any help plz would be good thx I'll put pic up
How did U clean itI would check the pcv hole on drivers valve cover and drill a bigger hole in it when you take it out . Mine was blocked and caused that sludge all through the motor ....although I got rid of the sludge by degreasing the engine internally with some bad caustic degreaser as was much drama but it’s still going strong today .....oil intervals at 150000 on these motors are misleading to the unaware like I was and really refer to cars that do 20,000 a year ...I do my oil changes at least 7500 ...short trips are not kind to these motors. My engine never had a sludged filter but first sign was a oil pressure warning at speed ....I replaced the timing chains and guides/tensioners but they weren’t too bad ...... hope the inside of your engine is not like mine .
Using a caustic degreaser called veet read here You could use any concentrated degreaser like it but the caustic part really bites into that crusty sludge with a bit of scrubbing.....it will take your skin off if you dont protect your hands but nothing any good is actually good for human beings .Wat is the best way to clean??