Temperature difference between M1 0W40 and Amsoil 0W30

[PaJohn]

While I'll have to wait a few months to see the UOA on the M1 0W40 currently in my Audi, I thought I'd share some unscientific observations. First of all, my oil temps seem to be running about 5-10 degrees higher with the M1 0W40. Oil gauge always indicated around 215-220 with the Amsoil 0W30, now it's right on the 225 mark. Is this good or bad? I mean, does this indicate the oil is doing a better job of transmitting heat from the engine?

Secondly, and this is totally subjective, but my engine seems noisier, even though it's a heavier oil?

Like I said, I won't have the UOA for 2 mnonths or so, so we'll see what the numbers show at that time.


edited to fix the spelling of Amsoil

[ July 09, 2003, 09:49 AM: Message edited by: Patman ]

 

[Al]

I can see the 40 wt causing the engine to run hotter due to more heat generated by a thicker oil and possibly not as much oil due to higher vscosity. Don't forget though that it's now summer. Are you comparing the temperatures to tha same hot weather conditions.

 

[Patman]

It could be the thicker oil is making the engine work a bit harder, which is in turn causing the higher temps.

It's too late now, but I definitely would've stuck with the Amsoil 0w30 after seeing the results you got with it on not just one, but at least two intervals.

 

[PaJohn]

quote:

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Originally posted by Al:
Are you comparing the temperatures to tha same hot weather conditions.

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Yes, relatively the same temps.

 

[buster]

quote:

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It's too late now, but I definitely would've stuck with the Amsoil 0w30 after seeing the results you got with it on not just one, but at least two intervals.

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While I agree it seems Amsoil is a great match for this engine, why not try others? It might turn out to be that it's not the oil but the engine that is helping...in this case he could stick with M1 for convienience reasons. Plus we need more comparisons.

 

[mirou]

This is why I am going to use the same oil winter/summer, then see what the uoa says. I feel todays good 5W/10W30 oils should give equal results unless you are really hammering your car with high load driving.

Joe

 

[buster]

After pajohn's results,I might have to try S2k 0w-30 again. That is one of the best reports of any oil that I have seen. My car has had 3 treatments of Rx now and that might have been part of the problem.

 

[moribundman]

quote:

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I feel todays good 5W/10W30 oils should give equal results unless you are really hammering your car with high load driving.

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Good point. I'm "hammering" my car (Always have, always will) and I don't trust the 0W-40 in my engine. It's just a feeling, nothing rational.

 

[Dr. T]

I will go out on a limb here and say that it's because Amsoil is a "better quality lubricant". The M-1 is causing more friction and therefore more heat. It's not because of the 40 weight per se.

Likewise, with your noise issue as I have found the same thing with M-1 lubes...especially the 0-40...

 

[buster]

quote:

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I will go out on a limb here and say that it's because Amsoil is a "better quality lubricant

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I will go out on a limb and say your wrong.

So what was S2k when it didn't perform well? Was it a better lubricant then? You have to read ALL of the UOA's to base an opinion on it, not one.

.....but you could be right.

Bottom line as I see it is we havn't seen enough proof to really say what is better yet so I think we all jump the gun a bit. Although Terry has seen more then enough so I'm leaning towards Amsoil, Redline and Schaeffer's being better lubes then M1.

[ July 10, 2003, 07:37 PM: Message edited by: buster ]