Oil/Fuel Dilution Concerns...

[Franko Manini]

I ran pennzoil ultra platinum 5w30 this summer. Only thing I noticed was a quieter engine. Back to pennzoil up 0w20 for the winter.

I think that's reasonable, especially if you don't have a fuel dilution issue. See my reply to @MustardTiger for more detail.

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[Franko Manini]

Here is my last two changes. Notice the first change was 396 miles, column to the right. Fuel dilution much better and contributed to proper driving to seat the rings.

Tim, you're 100% correct. fuel dilution will be high until the rings seat properly. with only 0.6% fuel in oil after 2700 miles I think you will probably be just fine going forward unless your driving habits or environment change. That can also influence the results.

What did you change in your driving habits during the break-in period?

 

[TimC.]

After the first 396 miles I conducted multiple dyno simulations driving in manual up hill and full rpm red line. You must be smooth on the throttle just as if you were in the dyno room. Frequency was 2-3 times per week until the 2700 mile mark. I let oil analysis determine when I stop this. I know my piston rings are sealing quit nicely now.

 

[MustardTiger]

Checked my oil temperatures while driving highway yesterday. After 20 mins it settled on about 198-200f. Doing some hard pulls from 3k-redline, in 4th, up some grades, I got it to 210f. But cruising speed it’s kept close to 200f. Ambient temps were 39f.

So in reality then, even at highway driving, any fuel in the oil will barely begin to evaporate at those oil temps. I’ll be curious to see the engine oil temps when it’s -30c

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