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Oil inside my radiator

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Old 02-12-2015, 04:25 PM
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Oil inside my radiator

Ok so my truck is a 1988 toyota pickup v6, base model, with only 80,000. I recently noticed that there was a brown oily sludge at the top of my radiator. I sucked out whatever I could get out and never thought it would be this bad but then it happened again except it clogged the heater core making me lose heat. I realized this and pulled the radiator out and emptied it, cleaned it it with a hose, and cleaned out all the hoses and especially the heater core. Once I got all the brown oily sludge out I filled it back up with green 50/50 antifreeze. Now as of the ride home today I lost my heat once again. I heard that the head gaskets are a problem but it seems that it's the later 90s and also the last owner(first owner too) said toyota did the head gaskets before he let it sit, but idk when mileage wise. What I want to know is, could it be the head gaskets again or is it something different. Oh and one thing to note is that it sat from 2000 to about 2010 so maybe the gaskets somewhere are dry rotted or just swelled and broken
Old 02-12-2015, 07:31 PM
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If you have an automatic transmission, you may have an internal leak in the radiator between the coolant portion and the transmission cooler portion.
Old 02-13-2015, 04:54 AM
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Nope my truck is a five speed
Old 02-13-2015, 08:39 AM
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Oil has no business in the cooling system, so unless you can determine that it's not oil at all, then you've got a problem. Most likely the head gasket. The fact that it's "relatively" low miles (when did 80k turn into "low" miles?) doesn't matter. The fact that it's 27 years old doesn't help.

DO check for water in the oil (chocolate milkshake), but it's absence doesn't rule out a bad head gasket; there's no guarantee the leak runs two ways. DO a compression test, but I'm going to guess you have good compression (with the only leak oil->coolant).
Old 02-13-2015, 11:29 AM
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Originally Posted by scope103
Oil has no business in the cooling system, so unless you can determine that it's not oil at all, then you've got a problem. Most likely the head gasket. The fact that it's "relatively" low miles (when did 80k turn into "low" miles?) doesn't matter. The fact that it's 27 years old doesn't help.

DO check for water in the oil (chocolate milkshake), but it's absence doesn't rule out a bad head gasket; there's no guarantee the leak runs two ways. DO a compression test, but I'm going to guess you have good compression (with the only leak oil->coolant).
Agreed, you have a bad head gasket most likely, the mileage doesn't mean a thing especially to a 3.0 with known head gasket issues.
Old 02-14-2015, 04:21 AM
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Yes IMO it is the head gasket too and the only reason I say "low" mileage is that the HG have been done and I've only heard of problems at way higher mileage. I do realize it's an old truck so really anything could happen. Thanks for the replays though
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