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Discussion Starter #1
I know a few of you guys out there are running Mobil 1 M/Sport engine oil out there.

Was wondering what reading you get of the oil temperature on the motorway cruising at around 80-100MPH.

Also when thrashing it on the motorway. Just rough figures would be fine.

It's just that ran Esso Ultron 5W40 before this and the oil temp never went over 100.

Now on m/way cruising it sticks at above 100 and when thrashing over 120!!!

With the Esso it used to be around the 80-85 mark most of the time.

Thanking you in advance

P.S. Running approx. 380-400BHP
 

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The 15/50 is very good for prolonged/ touring use, the 0-40 is not good for any prolonged/ touring use, just my opinion.
 

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Agree, I've used Mobil 1 Motorsport in my 33 for the past 2 1/2 years, done lots of track days, running higher boost, seen high oil temps on track, no problems at all. Just make sure you change it regularly. Normal Mobil is too thin for turbo charged cars.

R33 v-spec, can't understand how it should lead to higher oil temps for you. Perhaps you've got another problem and it coincided with your change in oil....?
 

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I used it for a while then saw oil temp did get high on mways 110-120dgres use castrol rs now seems to be better.
 

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Discussion Starter #6
Thanks for your help guys.

I know that the 0W40 is too thin, which is the reason why I didn't use it. I know the 15W 50 is quality and alot of the specialised oils are of that or near that viscoisty.

But I think M19 GTR is with me on this. I have definitely notuiced a rise in temp.

I know PeterE has an oil cooler for sure, so that maybe why you didn't notice the rise.

I think may go back to my Esso.

BTW M19, isn't Castrol RS 0W40??
 

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The clue to the higher temperature is the word weight, thicker oils are heavier as a term of mass, there fore they take a lot more heating to reach any temperature, I was thought mad when I actually weighed lots of oils by the pint, there is quite a large difference, so when you combine a 15/50 or 20/50 with a high mass fluid you get good protection and added heatsoak capability.
 

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Discussion Starter #8
That is exactly what I thought. And theres is also a slight increase in oil pressure which is good.

But when driving fast on m/ways or overtaking bursts, the temp. goes to around 120, which I was quite worried about considering I never saw the gauge go above 100 with the other oil.

But that is what straight away came to mind when I saw the increase in the temp.

But now my other Q; is it safe to run the car at that sort of temps?? IMO i think not. And considering it went 120 only on a short burst of power, I'm worried what it'll do on a long run at high speeds.

Any other opinions after this post???
 

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IF the gauge is correct, then running at 120c is terrible for oil, almost any oil imaginable for car use will degrade seriously and damn quickly too., check that if you have an oil cooler that it actually opens correctly, you can connect an oil cooler incorrectly and this will impede the flow, making the oil show a good pressure, in fact a bit higher than normal is possible, but it is restricted in the flow rate, I would check the valves and stats.
 

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Discussion Starter #10
My car doesn't have an oil cooler so this may explain why.
 
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