Loss of engine oil at high rpm

For a 83-89 2.6 liter engine, 3.5 liters with 0.5 liters for the filter
For 89-91 2.6 liter engine, 4.9 liters with 0.4 liters for the filter
For 89-91 3.0 liter engine, 4.9 liters and 0.3 liters for the filter

no car stated, huge NPR truck no less.
no year stated
so no free book information on that engine,.
big diesel. 4HL1, no dash letter?
compression at spec.?
glow plugs work.,
filters clean. water in fuel,
does test fuel (spray'd) help? ???
injection problems
lack of startup air.(filter)


The 4HL1 is a common rail direct injection OHC 16V high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 333 Nm, peak power is 140 PS (103 kW) at 3,000 rpm. Maximum torque is (34.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-N is a common rail direct injection OHC 16V high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 333 Nm, peak power is 131 PS (96 kW) at 3,000 rpm. Maximum Torque is (34.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-TC is a common rail direct injection OHC 16 V turbocharged and intercooled high-pressure fuel injection system engine of 4.777 L capacity with electronic control system. Peak torque is 425 Nm, peak power is 160 PS (118 kW) at 2,700 rpm. Maximum torque is (43.3 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-TCS is a common rail direct injection OHC 16 V turbocharged and intercooled high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 500 Nm, peak power is 179 PS (132 kW) at 2,700 rpm. Maximum torque is (51.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.

Replace the air filter and IAC idler air control valve.

Look no further for help,
try this website ? www.reliable-store.com

White SWEET smelling smoke, or white OILY smelling smoke? If it's white thick SWEET smelling smoke, you have a blown head gasket - that's the smell of antifreeze burning in the engine, which it should NEVER do. If it's white OILY smelling smoke (smells a lot like diesel), then you're getting too much fuel into the cylinders.

If it's sweet-smelling smoke (antifreeze), pull the oil dipstick & check the oil level. If the oil level is HIGH and the oil looks like a mocha milkshake, that's absolutely conclusive - that's what happens when antifreeze gets into your oil, and it's nasty corrosive to engine parts.

I'm not at all surprised that the oil light is on if it won't start - you won't get much oil pressure until the engine is running.

7-7.5 liters

A low reading of 20psi is not dangerous. As an engine wears, clearances increase and allow some oil to escape out the sides of the bearings. Even at 15 psi you would still be OK.
There are several other causes for a low reading. Make sure the oil is not contaminated with fuel (smell the oil on the dipstick). If the oil has been in service too long, pressure can also drop...Oil has a VI rating (viscosity index). Especially in inexpensive oils this index is maintained by additive packages added to the oil base. Those additives break down from heat and shearing forces inside the engine.
If you are using any 5w oil (except synthetic) discontinue using it. Even in colder climates, most engines don't need anything that thin. Most synthetic oils are thinner than conventional lubricants and will give low readings...in that case, it's not a problem because they are so far superior that there is no sacrifice in protection.
As far as the difference between at idle pressure and at speed pressure, that is normal. Your oil pump is driven off the camshaft. As the engine rpm's increase the pump spins faster, giving you higher pressure as needed. When I build any engine, I always use a high pressure high volume pump. Even with those, idle pressure is lower than driving pressure and pressure always becomes slightly lower as the oil heats up.
So, the pressures you see are good, providing you hear no noises. Use a good quality oil 10w or 20w (better) as a first # and no less than 30 as the second number. If you want to add your own additive package, Use Lucas oil stabilizer or a small amount of marvel oil. Lucas will increase the VI number and marvel is a good cleaner as well as the fact that it seeks out hot spots where other oils run from them. Change your oil at 3,000 to 4,000 miles (depends on how hard you drive), Always use a good quality oil filter and you should not have a problem

sounds like your lifters or valves are rattling!

4d56 is a diesel engine, fuel, oil, air filter change definitely, regular oil change, check tyre pressure, etc all basic things u can do yourself, after all its no 40+ MPG modern diesel engine its been around for years and years and being used in courier van, pajero and delica, i have a Delica with 4D56 turbo and its loves drinking diesel like no tomorrow, run it on veggie oil like i do you wont worry too much about your fuel consumption.

any 15w/40 diesel oil is as good as another in todays world,toyota oil is one of the major companies oil anyway,if you stick to caltex esso shell ,bp any of the major oil producers you cant go wrong ,,even pensoil valvolene no worries