Quote:
Originally Posted by somerandomguy
Good morning,
i bought a 1990 toyota corolla 1.8 diesel idi. It has 290,000 km. Perhaps an engine flush would loosen the crud and sludge in the engine and make better fuel mileage. I have been getting around 70 km/g around 44 mpg. I have heard about engine flush with automatic transmission fluid, kerosene, or diedel. I am a little apprehensive to flush such an old engine, because i have heard that the after engine flushes some old engines begin to leak and i would not like this.
Cheers
Jorge
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If you flush, do not replace the entire oil with something other than motor oil.
Option 1:
Frequent oil changes with cheap oil, about once every tank of gas untill the engine is sufficiently clean.
Option 2:
Get the oil up to temperature, shut the engine down, add 0,5L diesel to the crankcase, let the engine idle for 15 min, shut it down and drain the hot oil quickly.
Under no circumstance replace the entire engine oil with diesel/ATF/whatever that isn't motor oil.
That will likely cause bearing damage.