Mobil 1 5w20 in ford v10 half oil gone in 3100 miles and 11 months.

Quantico

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Sounds like low compression……you are leaving it in gear on a hill and expecting it not to roll. I expect you’re using 1st?
Its been doing that since I switched from ford oil in 2001. Same house. Not a huge slope. So I dont think my engine has had low compression 116 k miles. Its never used oil until the last 11 months 3000 miles ago..

By the way looked at the tech serv bulletins. Ford changed to 3 w 30 almost 19 years ago. Then went back to the orig factory recomendation of 5w20 maybe 17 or 18 years ago.

So the 5 w 20 is current correct spec and correct for the tsb stuff
 

Quantico

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Got back my oil analysis today. Looks bad to me but I am no expert at understanding how bad my engine may be.
 

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UPDATE.. not super interesting but my truck in first gear has always rolled a bit on my garage driveway slope. Its not a huge angle. And the truck has done this as soon as I put in mobil 1 5w20.
Truck rolled about 10 to 12 feet from where I parked it last night in gear. No park brake on..

Again this is how the truck has always acted with hot 5 w 20 oil..
But it was not further than usual.
And my clutch is almost new. Only 30 k miles on it since a shop thought my clutch was bad at 80 k miles. They pulled the clutch and measured it as 10 percent worn. Opps


So it’s the 5w20 that makes it roll on a sloped driveway when parked?

Why don’t you use the parking brake?
 

Quantico

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So it’s the 5w20 that makes it roll on a sloped driveway when parked?

Why don’t you use the parking brake?
No big reason. I just found it interesting that the switch to mobil 1 5 w 20 oil was thin enough that my truck could very very slowly roll a few feet .. but it did not do it with conventional oil.
My driveway is 125 feet.. no other cars in front of my truck. And when it chooses to slowly roll it a few feet before the engine cools and it cant roll.
I just always found the situation interesting as an example of great oil.
Everything has to be just right. Pretty hot weather.. tires to near 80 psi. Never tried leaving it in reverse..
I have sat in the truck a minute and left the brake on.. and the engine cooling the first few minutes seems to stop the slow engine movement.
I find it interesting this has gone on about the same for 20 years..
 
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