Join Date: Jul 2008
Feedback Score: 0 reviews
I've heard before about oil samples, where do you guys get oil tested?
I was changing mine every 3000 but got busy and ran it past 6000. What a mistake, I knew it was using a little oil but it had used up 7 of the total 10 quarts. I really dodged a bullet since my oil pressure is right back where it should be. I'm checking the level weekly now. I've run 600 miles in the last two weeks with no sign of consumption yet but who knows how accurate the dipstick really is. For years and years on many vehicles I've planned to but never have done what I did with my old drag car. What I did with it was drained all the oil then added one quart at a time (7 quart pan) I scribed lines on the dipstick for each quart. The car ran better ET's with only 5 quarts and the pressure was fine, this was due to less oil drag on the crank.
As a rule I no longer switch a vehicle to synthetic that has had dino oil all it's life. Porsche now recommends Mobil 1 for all their cars, past and present. My 911 is a 1966 with a 1983 motor. I switched it to synthetic based on Porsche's recommendation and within 100 miles it had developed leaks, particularily the rear main seal. I switched it back to 20w50 regular oil and it took several oil changes and about 6-7000 miles for the leaks to stop. Expensive lesson, the car takes 13 quarts per oil change. I later learned that the rubber seals are slightly swollen from dino oil and that they shrink back a little with synthetic which causes leaks. There is also some evidence that synthetics will leak due to just being thinner. I've never found synthetics to be all that great anyway. My drag car (410" stroker 351w) got it's oil changed 3 times a season and torn down for inspection every winter. I kept records of bearing thickness, journal diameters, and bore size, all measured with proper digital micrometers an a bore gauge. Comparing a season on synthetics to one with dino showed really no difference. When I sold the engine to my brother it still had the cross hatching in the cylinders. I'm getting my Rotella from a local trucking company that I do computer work for at 5 bucks a gallon compared to the $12 that Azone charges, perhaps I may start changing it sooner than 3000 miles.
My only comment on the oil "blackness" is that the diesel seems about the same as a carburated car but worse than a modern EFI car.
1986 F350 Crew Cab 4wd DRW conversion. 1993 7.3 IDI, 5spd Sterling 10.25 4.10 rear, kingpin D60 4.10 front, 12" HD clutch. A Banks waste gated turbo. Midwest rebuilt IP turned up. AC Delco 6.5 GM 12V GP's, working great. Running W80-W85 high performance zero-gel black diesel! 4wd and dually conversion is done. Washer mod on the D60 kingpins eliminated the death wobble. Custom 10" C-channel front bumper with military D-rings front and rear. Pintle hitch, receiver hitch, and goose neck hitch. 7800lbs full of fuel....