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Discussion Starter #1
I know there are a bazillion oil threads, but I'm not sure what I should do... Currently i'm running Amsoil 0W-20 signature series in my engine. The oil's doing a fine job, however it seems to burn off and i'm forever topping off the oil level. I'm trying to decide what viscosity oil I should go with next. Should I stick with the 0 weight and just bump it up to a 0w30? Or should I go to a 5W30 weight oil? Or maybe even thicker than that and go with a 40 or maybe even that 5w50 motorcraft synthetic that's used in the new 5.0s (JK about that, I know you guys would tear me apart with the "tight tolerance" thing with these mod motors). Seriously though, what viscosity would you go with?
 

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if your "forever topping of your oil" you maybe have issues with your piston rings
 

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Discussion Starter #3
I wouldn't doubt it. My GT only has 68k miles on it, but I have no clue how well it was maintained previous to me owning it. I just think that the 0W-20 may be a little too thin, but I don't know what viscosity I should try next?
 

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Discussion Starter #4
Actually i'm not so sure it's a ring problem. I don't get any blue smoke out of the exhaust, nor do I ever get a burnt oil smell coming from the exhaust.
 

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I know your car doesn't have "high mileage" but 5w30 mobil one high mileage is a great oil according to many tests i've seen and should do wonders compared to 0w20 when it comes to losing oil.
 

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I run 5w-30 in my mustang. My brother also runs 5w-30 in his.
 

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Your choice of oil is great, however if its going through oil then you have a mechanical issue that will not fixed with changing oil viscocity. Stick with what you have.
 

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What does topping off mean? How many miles are you going before you have to add a quart. Mine uses about a quart between 5,000 mile oil changes. I put in six quarts when I change oil and I don't top it off in between.
 

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Discussion Starter #12
It seems that it goes through about a quart of this oil every thousand miles or so. I've got about 3,000 miles on the oil, and i've put 3 quarts of oil back into the motor. I can't even contribute the consumption of this oil to the PCV valve issue, because I run breathers on my valve covers.

It's just odd how the car never smokes, and I never get that burnt oil smell. Not even upon startup does the car puff out smoke.
 

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i run 5W20 amsoil sig series in my car with no problems
 

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It seems that it goes through about a quart of this oil every thousand miles or so. I've got about 3,000 miles on the oil, and i've put 3 quarts of oil back into the motor. I can't even contribute the consumption of this oil to the PCV valve issue, because I run breathers on my valve covers.

It's just odd how the car never smokes, and I never get that burnt oil smell. Not even upon startup does the car puff out smoke.
Just because you run breathers doesn't mean the oil vapor doesn't go out.
A quart per 1,000 miles is generally considered excessive nowadays. In the old days that was a tight motor.

Increasing the oil viscosity only decreases the leak through your gaskets. Unfortunately, it also decreases the oil flow through your motor, especially if you are doing a cold start. You have already said your gaskets don't leak. You have already said that you do not have smoke through your tail pipes. Explain to me... what proplem are you trying to fix?
 

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Discussion Starter #16
I'm not exactly sure Eagle. I was thinking maybe a heavier oil would be a little more resistant to burning off as vapor like you had said. To be honest there really isn't much oil that came out of the breathers. My valve covers maybe have enough oil on them to make up for what comes out on the dipstick when you check the oil level.
 

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A quart every 1,000 miles isn't vapor. Its a lot but really not enough to smoke out your tail pipes. Multigrade oil viscosity is funny. If you are using oil on a cold start then not lator then you should go to 5w20. If you are using oil at normal operating tempature then you should go to a 0w30.

Since you don't know first go to a 5w30. But at one quart per 1,000 miles it isn't going to help.

My true recommendation is to protect your motor as much as you can. If that requires you to add 1 quart of 0w20 every 1,000 miles than so be it. That is just me. I have never minded adding oil to protect my motor. At 170,000 miles I still run 0w30. I want the cold start protection.

Edit: This is an old time recommendation. If your car doesn't drip oil on the ground and if it doesn't push blue smoke out the tail pipes then its probably a good motor. Just put a quart of oil in occasionally and enjoy your car.
 

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If it smokes any on start up, switch to a 5W-20. If not, go to a 0W-30. The only reason why Ford started recommending 5W-20 is to try to increase gas mileage. I would personally run a 5W-30. Leave the PCV system as set up from the factory. No reason to dick with it at all. As long as you run a decent oil filter, like a Motorcraft, you can run a 5W-X grade of oil with no cold start up problems.

Also, using a quart every 1,000 miles is still within Ford spec for acceptable oil consumption.
 

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if you have the gauges for it a compression leak down test will let you know exactly which cylinder your burning oil in. anything over 30% and you know its the rings

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