re: OT Mechanics - Question about Motor Oil

There's a TSB for this. Get your PCM reflashed, change your pcv valve and switch to 5-30 plus a bottle of Liquid Moly MOS2 and check your levels every thousand miles to see if it improves. From what I remember, there was too much suction in the pcv system during deceleration and oil was being sucked past the rings. That and there were issues with the plasma coated cylinders. If it keeps burning oil, it's going to burn your cats up so you may want to consider trading it in.

LINK to TSB

quote:

---

Oh and your engine is engineered for that specific oil specs. There’s a reason for it. Don’t just use a different spec oil and say well let’s see what happens. Dumb.

---

Then why does toyota recommend 20 weight oil for an American Toyota & 30 weight oil for a Japanese Toyota? I'll tell you why. America has the bullshite CAFE MPG requirements. It's all about fuel mileage not the engine. The Japanese engineers know 30 weight is better for the engine but bent the knee to satisfy the US Govt. All the auto companies do this BS to get the max MPG.

Keep same oil..change oil at 4000 mile intervals

This is a highly contentious issue and one I have changed my opinion on over the years as I have learned more.

I am just going to make declarations as I see fit at this point in my understanding.

1. your oil consumption is high but not super high

2. verify you have no leaks, I assume your mechanic has been under the car but to check for leaks you need to remove all the plastic shields, they can hide leaks. Some manufacturers (BMW is famous for it) actually put diapers on the inside of the shields which will mask pretty significant leaks but the shields alone can do it

3. this is the time you should be considering a high-mileage oil that contains something like seal swelling esters. M1 High Milage and Valvoline Restore and Protect are two good options. This may reduce you lost oil to some degree

4. moving to a higher viscosity oil (within reason) is 100% safe and almost every engine

5. moving from 5W20 to 10W30 is fine in that engine and will likely reduce oil consumption, especially if you live in LA or the rest of the south.

6. higher viscosity oil will cause a reduction in milage and horsepower, those are simple physics you can't avoid it but it will be marginal

7. don't use any oil additives, they can have bad interactions with the oils additive package, you simply don't know what chemistry is going on

8. if you tow a lot my oil recommendations would likely change as I would suggest something with higher shear resistance than the two I mentioned.

9. your mechanic was correct

quote:

---

Not even gonna debate with you on this. No offense.

---

Me either. I'm not an "Mechanic". I'm an old hot rodder.

Put 10w30 in it right now. Consider going to 10w40 for less oil usage AND better fuel economy.

That watery shite they got you using now is only good for their lab tested CAFE numbers.

quote:

---

My 2020 F150 5.0 L V8 burns an abnormal amount of motor oil, especially when I hit the gas hard.

---

How do you know it’s burning oil when you hit the gas hard? What color is the smoke, and how much.

10w-30 is fine. But the 10w number really doesn’t matter for you because that’s the weight when it’s cold. You are allegedly burning oil when it’s hot (running temp). The 30 will be heavier at operating temp, and you will burn a little less, but it’s not fixing a problem.

Also, are you sure it’s not burning within spec? The old 5.0 used to be 7.7 quarts and they increased the capacity to 8.8 because they burned oil. They added the extra capacity because they know it burns oil and during normal intervals between changes that extra 1.1 makes sure you still have enough oil even after burning some.


GM is even worse. Theirs used to be 6 quarts and now it’s 8. But they did the same thing. Just up the oil capacity so there will always be enough oil even after burning some.

Use the recommended oil but change to a high mileage oil. Helps condition seals. Change every 5000 miles. Once oil get burned and thin viscosity it can slip past the rings on older engines.