[QUOTE=DrUsmanNawaz;4968277]Bro LM is one of the top most oil producing company and they invest millions of dollars for the production of new generations of oil... So what they claim is based on their research... I don't think it will cause any problem even if changed at the mentioned intervals, but on the safe side one can change it after 15--20k Km...
An important thing is that the filters available here are not of ideal quality, so one must change oil filters after 10k...
As mentioned in brochure, one should also follow the car manufacturing company recommendations of oil change interval...[/QUOT
One should know which viscosity and treatments are required for the engine you are driving every engine has a different story in some engines sludge buildup is more than usual than need some other treatments and one engine with no sludge at all needs some other treatment's and oil selection will be done after engine analysis and wheather condition. And additives are added to smooth the engine parts and ensure the oil pressure is stabled. Drain interval dependeds on your driving style. Some peaople use their cars for short intervals and some even havnt warmed their engine's well while they reach their destination. In winter the 5W-30 special tech AA. Lasts in vitz, passo, and other toyota jdms vehicle upto 30k with filyer replacement interval of 8k. In summers this viscosity is not recommended as the thermal efficiency is dropped and I personally recommend my customers for. LM 5W-40 synth oil for all season motor oil and drain interval in summers lasts upto 15K for the peaople traveling in urban areas city jams, the people who drive on highways mostly I recommend them to change the synth oil at 20K in summers. For the winter season the scedule changes. For urban driving conditions oil change interval is 20K and for highways driving conditions can easily go upto 30K with filter change interval at 10K in winters. Plz note one thing the filter gets clogged only if the previous oilsludge is present in the engine and pcv system is not working properly. And if the engine is healthy and been flushed with engine flush then no need to worry about the filter because it be as new at 10k as it was on teplacemnt time will post a picture of filter changed at the interval of 10k.