The Critic
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The conversation will take place next week.Would you be able to explain using 10W-20 per Dave's suggestion? Have you decided what you will do?
It was Havoline ProDS 0W20 with HPL Engine Cleaner for 2K+.You got the consumption down to 8 Oz on a FB25 just by running some HPL engine cleaner??? Impressive.
Use whatever grade you used that gave you that consumption. Any FB25 with some mileage, I'd say over 50k that uses 1/2 quart over 4k miles, I'd tell that owner to pick up a lottery ticket.
Although I never tried it, I have a friend with 2 of these engines. He said he had good luck with installing restrictors on the hoses that go from the vc to the intake. That's one thing you might want to experiment with if you have time.
We're pretty strict on smog in CA; I think any modifications to the crankcase vent system will likely result in a failure during the visual inspection portion of the test.
I'm not too concerned about engine wear - the car will likely be sold/traded before 200k anyway. Probably 150K.CAFE awards and advertised fuel economy. Tthere is no good technical reason to do so. Film thickness is what protects and prevents wear.