Quote:
Originally Posted by track73
I had some loud lifter noise on my 455 swapped into my 65 F250. Marvel Mystery Oil. Fixed it. I have used every brand of Oil From RPM Delo., Havoline. Q State ,McMillan,Sears, Wards,Pennzoil,Wolfs Head, Cam2, and 15 cent re refined oil back i n the 60's. I read one time that the government is the biggest single procurer of oil so all oils must pass their specs to be able to sell to it.
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Yep. And how many of us have run a quart of Marvel or ATF mixed in with our oil to try to free up sticky lifters? How many of us have used a wide spectrum of viscosity oils in our engines to counteract excessive oil burning, try to bump up oil pressure on tired engines, and maybe even just because that's all we had left in the garage? How many of us have had old tired engines where the oil was heavily diluted with fuel due to blowby or excessive rich running, where the oil was broken down or old and thick or full of carbon, etc etc., and all these engines survived just fine? The idea that an oil of the recommended viscosity but with a slightly different additive package can destroy bearings quickly is just absurd.