Do you have any suggestion for the type of oil for AUDI A6 2.7 T 2001 regular or synthetic?

Answer 1

Synthetic oil is proving to be a superior lubricant for all engines. It not only lasts longer but also creates far less "sludge" and other buildup. Engine sludge is actually parafin, much like the wax that is used to make candles. The parafin breaks off of an oil hydrocarbon chain and bonds with other parafin molecules, until you create a large amount of sludge inside the engine. Regular oil changes can slow the process, since the parafin molecule typically starts to break off after the oil has been used for a while. But since the parafin has been removed from the synthetic oil, you'll end up with a far cleaner oil, plus the oil will not break down for up to 25,000 miles, giving you far superior lubrication inside the engine. While synthetic oils make claims to last that long, most people never use it for much more than 10,000 or 12,000 miles. But even then, it's far less expensive since you're changing less often, and you still have the advantage that it provides superior lubrication. The more reputable auto manufacturers will not specify a brand of oil, but will indicate the viscosity and request specific engineering certifications. Look at the top of the oil can/bottle for the engineering specification stamps, and read the owners manual for the recommended viscosity. All oil manufacturers offer you a choice of oil viscosities. Mobil 1 has a 0-40 euro formula that works great in the winter. But if you plan on taking your car to the track the heavier oil will cool the engine better. 15-50 for hot summer track days keep the temp down.