Thread: 4BD1T oil

Originally Posted by rick130

Don't these things have an oil/coolant heat exchanger ?
Wonder if the t/stat in the cooler is working ?
It should be dumping the excess heat into the coolant, and even with that workout the oil temp shouldn't exceed 110-115* or so if the cooler is big enough and working properly ??

Yes, oil/water exchanger right up the side of the block beside the injection pump. I don't think it's got a thermostat there, just relies on the water temperature being stable.
In such conditions the water temp reaches just over 100C but doesn't boil unless the hose to the reservoir tank ruptures and loses pressure (don't ask how I know this).

I don't know what pressure my oil light switch runs at. I figure an oil pressure gauge would just scare me into driving it less and fixing it more.

No thermostat - oil from the full flow filter passes through the cooler before it reaches the engine's oil galleries.

With the truck version, a small amount of oil goes to the bypass filter and turbo, and bypasses the cooler.

Originally Posted by Dougal

Yes, oil/water exchanger right up the side of the block beside the injection pump. I don't think it's got a thermostat there, just relies on the water temperature being stable.
In such conditions the water temp reaches just over 100C but doesn't boil unless the hose to the reservoir tank ruptures and loses pressure (don't ask how I know this).

I don't know what pressure my oil light switch runs at. I figure an oil pressure gauge would just scare me into driving it less and fixing it more.

On the recent trip to tassie, we had water temp at 109oC at one point!!!

120-130kph, HEAVILY loaded into a strong headwind - 700-750oC egt !!!!

However I have NEVER had the oil light flicker at idle.

Originally Posted by isuzurover

On the recent trip to tassie, we had water temp at 109oC at one point!!!

120-130kph, HEAVILY loaded into a strong headwind - 700-750oC egt !!!!

However I have NEVER had the oil light flicker at idle.

Do you have an oil pressure gauge? Next time you run it that hard, can you pull it into idle for a few seconds and see if the oil light stays out?

Originally Posted by isuzurover

On the recent trip to tassie, we had water temp at 109oC at one point!!!

120-130kph, HEAVILY loaded into a strong headwind - 700-750oC egt !!!!

However I have NEVER had the oil light flicker at idle.

For how long did you hold these loads may I ask!!!!!!!!!!!!!!! very interested.

Justin

Originally Posted by Dougal

Do you have an oil pressure gauge? Next time you run it that hard, can you pull it into idle for a few seconds and see if the oil light stays out?

We stopped very quickly once or twice when driving under those conditions (e.g. when we spotted wildlife). No flicker.

Justin - probably 2 days across the nullarbor we were sitting on 120 into a headwind, with a water temp of 90+ and EGT of 600+. Hopefully all will be well with the next oil analysis.

Ok
After getting everyones preferences I have done some real time on road testing. I tried the usual 15W40 oils which all seemed around the same.

I then tried the Penrite 25W60 Japan25 truck oil. This is for older Japanese units. This oil has so far performed very well. The engine is quieter at motorway cruising. Oil pressure runs at 60-65 psi through most of the rev range and sits at 25-30 psi at idle ( hot) and is a lot more stable. This remained stable for a whole days offroading etc.

So the main differance so far is the noise reduction and the more stable and slightly higher oil pressure when at running temp. Will see how it handles harder work as the next trip in 2 weeks will have the trailer in tow as well.

Thanks again to all for the initial input.

Justin

Mobil Delvac 1.