It is common as said, Make sure you use the revised oil filter... its the size of a tractor filter, is £5.00 from TPS or £8.50 ish genuine list price, depending on if you have a TPS, the idea is to increase the engine oil capacity a bit, 3.5l isnt enough and it turns to sludge to quickly, then change the oil using the correct grade and ONLY Fully synthetic every 5-6k miles to prevent problems in the future.
