Quote:
Originally Posted by Artan
I use full synthetic Castrol Edge TurboDiesel 5W-40 for my VW Passat 1.9 TDI 2003. According to the sticker the oil should be changed after max 15000 km or max 12 months. I drove now for 33000 km and 18 months. The oil is as new. If the oil is viscous and thin everything is ok. If it is thick and no viscosity then its bad.
I dont use any other additive for the engine. Every two months i clean the air filter with air pressure. The hummidity and the water in the oil is removed from the engine by heat and breather element of the engine. The point is that you should not leave the car long time without driving. I am talking for 3 and more months. The turbo pipeline can be clogged only if the oil is thick. When its thick it means it contains sludge, dust, rubbish. When it is thin and you check it on your finger its clean there is nothing to worry about.
My car is working very good. I dont see any difference and the oil has been used one time over its so called limits.
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You really need to have your oil lab tested. PD engines are notorious for wearing out cams for a variety of reasons, even when using the recommended oils at the proper change intervals. This wear shows up very well in analysis.
There are good reasons for lab testing engine oil on any vehicle for extended intervals.
1) Additives wear out. Humidity and exhaust byproducts create acids in the oil that consume additives. Use these up, and your engine wear will increase.
2) Soot and other contaminants need surfactants to remain suspended. Your contaminant levels can only go so high before they come out of solution and cause wear. These are much smaller than can be filtered out. A bypass filter can help.
I've only listed two. You are asking for trouble on your VW diesel engine, especially if you rely on finger-calibrated viscosity "measurements."