In a Brand new engine it is recommended that you get the rings seated before you start using Synthetic oils. So run your engine for 3,000 miles and then you can switch to a Synthetic.
The oil used in a 1999 Mitsubishi mirage is 5W-30. When engine the engine reach more than 150,000 miles switch to partial synthetic will help the life of the engine.
Only if the engine has low miles or no sludge build up - synthetic oil captures the carbon within its molecules and if there is to much carbon buildup (sludge) it will release the carbon into the molecules of the synthetic oil and run it through the engine - once the filter is bypassing there is nothing to keep the "liquid sandpaper" from wiping out the bearings.
Yes, just make sure it is a diesel rated oil. There are varying opinions on how long you should wait for the engine to break in first. 10,000 or 15,000 miles is probably safe. 5w40 is the commonly used synthetic diesel oil.
Oil does not wear out it just gets dirty. Change it every 7,500 -10,000 miles if you use synthetic depending on how you drive.
I did back in 2001 , and have used 100 % synthetic oil in my 1995 Ford Explorer ever since . As long as your engine is healthy ( doesn't leak or burn any oil ) I had about 51,000 miles on my engine when I did so I knew the piston rings had " worn in " As long as you use the same weight of engine oil that the manufacturer recommends and it meets the manufacturers specifications ( P.S. I'm not a mechanic / technician )
Using synthetic oil in a heavy-duty engine doesn't extend the drain interval. It cuts down on engine wear (especially the bearings, but the cylinder liners last longer too) and gives better fuel economy, so you should use it.
I have a 2004 Aveo with 190,000 miles. I use a name brand synthetic blend 5W30.
For the first 1600 km's or 1000 miles on a new engine just use regular oil. The reason being is that you want MORE friction in the engine to help the parts wear properly for a good "break in", synthetic oil has such good lubrication properties that it can interfere with proper engine break in.
i'd say its better. you might get leaks, because regular oil has bigger molecules than symthetic. i run synthetic in my truck with 193,000 miles all the time no trouble
no On the contrary ... best advice IS to use a synthetic on Turbocharged engines. The reasons is that the synthetic doesn't get as hot as normal paraffin based oils, thus helping to keep the engine, as a whole, running cooler and thus promoting longer engine life. I also change my engine oil AND engine oil filter every 3,000 miles (regardless of what the owners manual or the dealer says) - Respect your vehicle's engine and it will respect you also.
Change your oil/filter and switch to 100% synthetic. Drive it 1,000 miles and change the oil/filter again. This time add a can of Seafoam Engine Treatment to the crankcase that you can buy at most auto parts stores. Drive it another 2,000 miles and change the oil again and add another can of Seafoam. Drive it 5,000 miles and change the oil/filter. This should remove lots of the sludge.