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203* degrees

F

fastfarmall

Well-known Member
Just changed oil in my new to me car, it run 203 at 65 MPH, with Mobil 1 Synthetic, put in GM 10W-30 conventional oil, and it runs 217 degrees at 65, is that normal, must be that much less friction, or what?
 
My guess is the last time you checked the temp it was running at it was likely extremely hot like over a 100F outdoors and your AC was just a blasting. Now you are checking it in cooler weather and no AC, so now it shows cooler.
 
Had a landscaper that only put Mobil one in his mowers , he had the data to prove it was well worth it . It was over 5 percent improvement
 
To expand on what Used Red said there are a lot of variables that go into what temperatures a vehicle runs at. When we do dyno testing in the lab I've seen it take over an hour of running at 100% engine load for engine and hydraulic oil temperatures to stabilize and this is under very controlled laboratory conditions. When out driving on the road there's no way to control the many factors in play so there's really no way of drawing meaningful conclusions from the results. It it likely that the synthetic oil reduced some friction but probably not as much as your two temperature readings seem to suggest.
 
(quoted from post at 18:20:06 09/16/22) To expand on what Used Red said there are a lot of variables that go into what temperatures a vehicle runs at. When we do dyno testing in the lab I've seen it take over an hour of running at 100% engine load for engine and hydraulic oil temperatures to stabilize and this is under very controlled laboratory conditions. When out driving on the road there's no way to control the many factors in play so there's really no way of drawing meaningful conclusions from the results. It it likely that the synthetic oil reduced some friction but probably not as much as your two temperature readings seem to suggest.
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X2
 
Is the 10w-30 conventional approved for your engine?

It is critical to use the proper oil with all the valve timing and cylinder canceling technology going on. Especially with GDI fuel systems!
 
What model car is it and how old is it? Need to determine the normal temp for your car. Then if it's old there is a possibility the thermostat is stuck closed.
 
fastfarmall,

200 degrees thermostats these days. and 20 lbs. radiator caps. YOU answered your own question.

The Mobil 1 IS making a difference. It is the ONLY oil I use in my vehicles, and been doing that for decades,

Guido.
 
The air was off, both times,the same day, it was 63 degrees day. an d yes a GM Dealer put the oil in there, so better be the right oil!
 
(quoted from post at 14:19:42 09/16/22) Just changed oil in my new to me car, it run 203 at 65 MPH, with Mobil 1 Synthetic, put in GM 10W-30 conventional oil, and it runs 217 degrees at 65, is that normal, must be that much less friction, or what?
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I don't know if it's a normal difference between GM and Mobil1, but we use Schaeffer synthetic and there is a noticeable decrease in temperature with the Schaeffer. I think I've said this before. We send Schaeffer a lot of money, but their oil doesn't cost us a dime due to the absence of oil related failures. A friend of ours ran their oil in their crushing equipment. Their oil related failures disappeared. We copied what they were doing and got the same result. With higher engine temps these days, anything you can do to reduce temp or withstand temp will add longevity to your machine.
 
..The air was off, both times,the same day, it was 63 degrees day. an d yes a GM Dealer put the oil in there, so better be the right oil! ..
Then that is solid proof, that is real good stuff, no wonder they charge extra for it.
 
Any Synthetic oil will run cooler than conventional oil. Its the nature of the beast. But all modern oils are formulated to withstand temperatures up to 250 degrees without breaking down. You start getting up around 275 degrees and then you will have real problems.

So the real question now becomes do you think a cooler running engine is a better running engine ??? Years ago that may have been true but not today with 200 degree thermostats. Engines are made to and need to run hotter to preform properly.
 
(quoted from post at 15:20:06 09/16/22) To expand on what Used Red said there are a lot of variables that go into what temperatures a vehicle runs at. When we do dyno testing in the lab I've seen it take over an hour of running at 100% engine load for engine and hydraulic oil temperatures to stabilize and this is under very controlled laboratory conditions. When out driving on the road there's no way to control the many factors in play so there's really no way of drawing meaningful conclusions from the results. It it likely that the synthetic oil reduced some friction but probably not as much as your two temperature readings seem to suggest.
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Brendon, Very good post!!! so many people try to draw conclusions from one change and ignore five balls that they have in the air with no measurements or recordings.
 
I followed a dump truck today, 40 to 45 mph..

My Cadillac dealer uses 5x30 valvoline full synthetic.

This is my best ever 25 mile average on my XT5. 6/4 cylinder car. 2028 55k miles.


cvphoto135996.jpg

39.1 mpg.

I'm not convinced that one synthetic is that much better than another without actually doing side by side tests with same engine.


My car is under warranty and my dealer will do the service work.

I don't want to be blamed if something goes wrong.

Use what works for you.

No way am I telling me dealer what oil he should use.
 
Well of course! You were closely following a dump truck that all but eliminated aerodynamic drag on your vehicle. Just keep on following dump trucks.
 
(quoted from post at 14:35:17 09/17/22) Well of course! You were closely following a dump truck that all but eliminated aerodynamic drag on your vehicle. Just keep on following dump trucks.
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Might lose a few windshields but it's a small price to pay for good fuel mileage.
 
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