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Excessive Oil Consumption in Toyota Trueno

The car is Toyota Trueno GT-Apex 1991. It has 236,000km on it. It needs topping up with 1 liter of oil after approximately 3 to 4 hundred kilometers driving.

Is there any way to deduce whether it's the valve guides, valve seals or piston rings (or something else) without taking it apart? Am hoping it is something cheap and easy, but the high km's would suggest otherwise?

There are no oil leaks on the ground, it doesn't seem to smoke under normal driving conditions, but it does put out a lot of blue smoke at higher rpm's (over 6000 rpm). There is some leakage of oil coming out of the seals on the top of the head. On cold nights it smokes for 10ish minutes after start-up, but is hard to tell what colour the smoke is. (Is assumed it is the oil again).

Have gone from 15-40 to 20-50, but has had only 1 liter in it so far. Would the thicker grade make a noticeable difference over time? How about some kind of oil additive?

Reply to
ridge_rockfield
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two things you can try.

Get a compression test of the cylinders, including a wet compression and leak-down test. If the cylinders are easily accessible, you can do this yourself with a pressure guage. That should give you some idea of the relative shape of the rings and valves.

Tighten up the valve cover bolts to correct torque. They do loosen over time, and retightening them may reduce oil leakage out of the covers.

I don't expect a heavier weight oil to be of much help for your symptoms. I also don't think additives like the ones sold to stop oil burning will help much, but you could try them.

Reply to
Knifeblade_03

Thanks. Will get a leak-down test on the engine. And will try tightening the bolts on the head. Unfortunately they don't seem to be releasing the excessive amount of oil that is seen consumed, but anything is worth a try right now... Thanks again mate...

Reply to
ridge_rockfield

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