XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Is this Oil Temperature OK without an Oil Cooler?

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Old 05-26-2017, 04:43 AM
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Default Is this Oil Temperature OK without an Oil Cooler?

When my Oil Cooler broke on 'Cherry Blossom' my 1990 XJS 5.3 V12 which I am restoring.

I temporarily replaced the Oil Cooler with a by-pass Pipe, which I had made up for the job.

The reason being I want to get her past the MOT before I spend £300+ on a New Oil Cooler with Pipes.

In the UK we don't normally get the Scorching hot Temperatures of the USA but yesterday was about 18/c

Which is considered to be very hot in the UK.

After half an hour of driving round my garden, I took a digital reading with my hand held digital temp gun.

Where I got a reading of 110/c which I suspect would have been a bit Cooler, had I been driving along an open road.

Is 110/c an acceptable Temperature for the Oil, or is it getting too Hot?

The Oil I am using is a good quality 10/40 Semi Synthetic.
 
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Old 05-26-2017, 05:17 AM
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Broadly speaking....

According to many sources 95ºC-110ºC is an ideal range. About 127ºC seems to be the danger point for conventional oils. The danger point for most synthetics is about 149ºC.


Cheers
DD
 
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Old 05-26-2017, 07:45 AM
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Doug nailed it.
 
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Old 05-26-2017, 09:55 AM
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Cheers Doug!

That's very reassuring but when I take out my Grey XJS which does have an Oil Cooler, it could be interesting to see how much difference having an Oil Cooler makes.
 

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