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Mileage is 30% in-town, 10% unloaded highway, 60% towing highway. Tow miles are either with a 4000lb flatbed or a 9000lb enclosed, mostly with the big enclosed. Thoughts on the wear? Truck has 175k on it now, with 5k on current oil. I am going to change the air filter and the oil and send...

I'm having some blowby issues in a fresh race motor. It's an 1862cc Mazda BP block in a Miata, currently fed 12psi via a Garrett GT2871R. The motor is putting out 2-3oz of oil through the crankcase breather every 8 laps or so. The motor in the car before this was very similar and had no blowby...