Little update.
Went for a 800+ miles trip yesterday. With AC on all the time and 92% highway miles, with cruise speed of 75 mph, car used half of tank in 285 miles.Which is really good,for that age,size of car, and engine size.
Car puffed some little smoke today. Oil has more than 1300 miles as for today, and it's down to middle mark more close to max mark.Haven't top off yet, will keep it somewhere in the middle.
Had burned coolant smell, while stopped on gas stations. Will check all hoses again at 2000K mark,might be also old radiator cap(+looks like I overfilled cooling system, overflow tank is like 2-3 cm higher then max), when I will change out filter.
Thinking about topping off after filter change with 15w-40 Mobil Delvac, I do have open gallon of 5w-20 Valvoline,and same weight quart blue bottle of durablend, but I think it is more suitable for top off in winter time.
Why 15w-40 Delvac?Because it is very hot, oil shears down with usage and more cleaners in diesel oil.Another reason, I will fill up with it only at last point from my stash, since I plan to use G oil 5w-30 from stash for winter fill, then 10w-40 Maxlife for summer fill,Then 10w-30 PP(4 gallons).