When was the last time the timing chain was replaced? I bought a 1991 Toyota pickup that had 190,000 miles and the original timing chain. Due to the high miles, the chain had stretched which caused a lot of slack in it. This slack allowed the chain to rub the timing chain cover causing a hairline hole/crack in it. Antifreeze leaked thru the crack and filled up the oil pan.
Good luck...
This is a typical sign that you may have blown a head gasket(s).
Where is the oil filter located on a 1991 toyota pickup
You will need to drain the oil from your 1988 Toyota Pickup truck oil pan. Remove the oil pan by removing the oil pan retaining bolts. Scrape the old oil pan gasket off. Clean the oil pan gasket surface. Put the new oil pan gasket on and reverse the process.
it has an oil filter, fuel filter, air filter, but no trans filter.
In the oil pan
The engine oil capacity of a 1990 Toyota pickup is 5 quarts. This includes replacing the oil filter which stores a small amount of oil.
on the oil pan under the truck
possibly a head gasket is cracked
they leak oil from the oil pump on the front of the engine
10w-30
It sounds like your engine block grounding wire.
90 weight gear oil.
Gear oil, Best place to get it is at WALMART.