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Old 07-12-2015, 11:49 PM
sonny sonny is offline
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Location: Austria / Europe
Vehicle: 740 GL - 120.000 km :)
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Default Question about the original Oil Cooler


I have upgraded my Oil Cooling System with a 9 Row Oil Cooler, With Adapter on the Oil Filter Flange.

I leave the original Oil/Water Exchanger where it is, but disconnected the Water Hoses from it, Because my Wastegate of my new Turbo had a Collision with it

I Have a turbopressure and Water Temeprature Gauge- Everything is OK so Far. But i have NO Oil Temperature Gauge.

What do you think ? I Am worried about high Oil Temperatures (1. Because the original Water/Oil Exchanger doesnt work anymore because i removed the Water Pipes from it, and I Hope that the 9 Row Oil Cooler is Enough to Cool the Oil)
My Oil Cooler had a Thermostat in it :-) (So it should warm up quickly)
I Donīt want to blow the Engine with to High Oil Temperatures ...

Red Marked Hoses are Removed by me.

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Old 10-25-2015, 08:07 AM
Goteborg Vapenfabrik Goteborg Vapenfabrik is offline
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Unless you are running a performance setup according to D24 efficianado Tom Bryant the oil cooler is completely unnecessary and far more likely to cause damage than save your
D24T from high oil temperatures. Fully synthetic oil is a big temperature reducing factor.
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Old 10-25-2015, 10:04 AM
ngoma ngoma is offline
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Part of the reason the factory included it was to help warm the oil in a cold engine. But I agree, the coolant/oil heat exchanger can fail, allowing the coolant and oil to mix, with bad results.
1985 744 gle d24t
1985 745 gle d24t
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Old 10-28-2015, 05:36 PM
v8volvo v8volvo is online now
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Originally Posted by Goteborg Vapenfabrik View Post
Fully synthetic oil is a big temperature reducing factor.
To my knowledge, it's not so much that synth reduces temps (though it may do that to some small degree), but rather that it stands up to high temps better - doesn't break down like conventional oil does, and much less tendency to sludge, coke, deposit buildup, etc. It seems to be true that for moderate driving, on flat terrain and in moderate temperatures, you can do away with the cooler and not suffer any functional repercussions to speak of.

But for serious driving under load in warm conditions, with the oil in a D24T absorbing heat from the turbo and piston-cooling spray, I think you definitely still want a cooler of some kind in the circuit. Synthetic or not, the oil plays a role in keeping the engine cool, and while synth can get hotter without having problems of its own, the components it's designed to cool still need it to stay at a temperature that makes the cooling effective. (And even synthetic oil has a temperature danger zone that you'll want to stay out of.) Tom Bryant also says that D24T engines have no cooling problems, which is presumably the truth in his particular usage conditions, but those of us who do serious mountain driving in the western states and subject the motor to sustained loads at high ambient temps know that keeping these engines cool when they're really working hard is a challenge not to be underestimated. Assess the oil-cooler debate from the same logic; YMMV depending on what your situation and intended use is.
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Old 11-04-2015, 09:55 AM
R.Mojica R.Mojica is offline
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I have an oil temperature gauge in my 85 that I installed recently. Click the link
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Old 10-14-2020, 04:08 PM
RedArrow RedArrow is offline
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Originally Posted by R.Mojica View Post

I have an oil temperature gauge in my 85 that I installed recently. Click the link
Hi R!

That's nice. I have a 780 cluster that has the oil temp gauge setup that I could use in my td cluster...
but where/how did you source the end that is at the oil pan? Could you share a link to the exact part or recall what Volvo's setup you used? THX.
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