I appreciate your opinion but have to disagree with your overly cautious approach towards modern engines and oils. While modern engines are manufactured on tighter tolerances due to better tooling and machining technologies, the materials used in the engines have improved in strength and endurance as well. Same is the case with oil and water pumps.
I have worked on, maintained and driven older and newer engines over the years and my opinion is not only based ontech articles (which I will also share for your research purposes) but practical hands on experience as well. I can assure you that switching from the suggested oil for Liana (10W30) to 10W40 will NOT harm the engine at all in the temp ranges we live in. Heck, throw in a 20W50 and it will be fine as well. The chart I posted is an SAE rating chart and was not made by me but there is decades of research and development that went behind it.
I repeat again, a 20W50 oil in place of a 10W30 will not blow your engine of result in premature oil pump failure in the temperatures that these cars operate in. There are other ratings on the oil container that are rather more crucial which are called API ratings. Then comes the role of synthetic and semi-synthetic blends. One cannot simply attribute engine health to just viscosities because there's more science to it than that. The only 2 effects (extremely minor) will be :
1- The oil will take a split second longer to circulate at very cold temp startups. This will be compensated with added protection at high revs and high temp operation.
2- There will be an extremely tiny loss of HP. So little that it won't result in a significantly noticeable loss of power or fuel economy.
Oil types, ratings, viscosity, choosing good oil
Motor Oil Viscosity Grades Explained in Layman's Terms
Engine & Gear Oil - Temperature and Viscosity Limits
Car Bibles : The Engine Oil Bible
I would have gone into the discussion about Dynamic and Kinectic viscosities and engine oil characteristics at various temp ranges but it would become too technical.