Engine oil capacity and type please?

15w40 is mostly for diesel engines not gas. if they have synthetic get that in 0w30 as that is what is recommended or 5w30 if not available. air filter if used in dirt/gravel areas should be replaced every 6 months if not once a year. your car is listed at 4.2L for a oil fill Toyota genuine motor oil is also recommended or equivalent. Here is a guide to help walk you through the oil change with the oil type and capacity below.

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

Oil Grade Oil Viscosity (SAE)
ILSAC multigrade engine oil 0W-20

Standard Oil Grade (for Mexico)

Oil Grade Oil Viscosity (SAE)
API grade SL "Energy-Conserving", SM "Energy-Conserving", SN "Resource-Conserving" or ILSAC multigrade engine oil
0W-20
5W-20
5W-30
10W-30
API grade SL, SM or SN multigrade engine oil
15W-40
20W-50

Standard Capacity

Item Standard Condition
Drain and refill (with oil filter change) 4.2 liters (4.4 US qts, 3.7 Imp. qts)
Drain and refill (without oil filter change) 3.9 liters (4.1 US qts, 3.4 Imp. qts)
Dry fill 4.7 liters (5.0 US qts, 4.1 Imp. qts)

Please let us know if you need anything else to get the problem fixed.

Toyota's are a bit touchy when it comes to oil. Plus with modern engines you don't want a thicker oil in them as it can cause a lot of problems with the variable valve timing and the timing tensioners. Perhaps you could order the oil you need in a larger quantity? Or see if it's possible to have someone ship it to you? Not familiar with the way things work there. I'm more used to being able to buy any oil needed just about anywhere.

HMAC is correct on the air filters, also changing the cabin air filter at those intervals would be a good idea. Keeps the dust and crud out of the interior and let's the AC operate without restrictions.

You will require 4.2 liters or 0W-20 this is Toyota spec change the oil filter and always fit a new sump plug sea. I would recommend a genuine filter there not expensive, check all fluid levels, replace air filter and cabin filter at this service and rotate wheels front to back, visual inspect belts for cracking. Check hoses for signs of leaks. If you can remove a front and rear wheel to inspect brake pads, check tires for wear and inflation. Brake fluid is often replaced every two years as is coolant, there is a test to check the viability of both fluids. A mechanic can do this in a few minutes if you want to see how they are. If jacking up car always place on safety stands on firm level surface.

Running the engine without oil is never a good thing.

Listen to engine for knocking, ticking, if you hear none, then you MAY be OK.

The only way to tell for sure is to dismantle the engine and check bearing clearence.

Either a problem with the sending unit light or the engine is full of sludge and actually has low oil pressure. if the vehicle has its oil changed every 3000 miles you most likely dont have anything to worry about but if you don't change it every 3000 you could be in trouble. Here is a guid to help you change the oil with the oil type and capacity below

https://www.2carpros.com/articles/how-to-change-engine-oil-and-filter

Fluid Types
Engine Oil Type

GRADE .................... API SL Energy-Conserving or ILSAC multigrade engine oil

VISCOSITY .................... SAE 5W-30

Capacities

Engine Oil

With filter .................... 3.9 Qts.(3.7L)

Without filter .................... 3.7 Qts.(3.5L)

Dry fill .................... 4.3 Qts.(4.1L)