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fascinating. i've used both synthetic and conventional with excellent results either way. mosier specified conventional in my mosier 60, but they couldn't tell me why.

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My Strange S60 had a sticker on it warning against synthetic lube.

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I beleive a lot of the high dollar imports, Lexus, BMW, Jaguars, Mercedes Benz as well as some others come from the factory with pure sybthetic oils in the engines. I think that maybe some American cars do also, maybe not I know a lot of NHRA class racers swore that there cars pick up ET and MPH when they switch to
multi viscoty synthetic oils

The new vettes and mine 2000 Transam firehawk and i even think ford did with thier 03-04 corbas. My 97 honda cbr900 picked up a tenth going to mobil 1 15-50 . also i forgot my wifes 06 gto come from the factory using mobil 1 syn

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I beleive a lot of the high dollar imports, Lexus, BMW, Jaguars, Mercedes Benz as well as some others come from the factory with pure sybthetic oils in the engines. I think that maybe some American cars do also, maybe not I know a lot of NHRA class racers swore that there cars pick up ET and MPH when they switch to
multi viscoty synthetic oils

The new vettes and mine 2000 Transam firehawk and i even think ford did with thier 03-04 corbas. My 97 honda cbr900 picked up a tenth going to mobil 1 15-50 . also i forgot my wifes 06 gto come from the factory using mobil 1 syn

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You can add the Crossfire to that list. My 04 X-fire takes Mobile 1 synthetic from the factory - 7500 mile oil change interval.

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I ran synthetic in my 8.75 a several of years ago, and did not like the scuffed look on the teeth, switched back to dino oil and problem went away.

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I beleive a lot of the high dollar imports, Lexus, BMW, Jaguars, Mercedes Benz as well as some others come from the factory with pure sybthetic oils in the engines. I think that maybe some American cars do also, maybe not I know a lot of NHRA class racers swore that there cars pick up ET and MPH when they switch to multi viscoty synthetic oils

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i use dewco,,, but probably bought the sales pitch from don,, plus maskin used it in their pro stock car..

i ran a hemi on teuton's dyno about 6 or so years ago,, i was given a bunch of mobil 1 syn oil,, like you buy at the parts store,, in the gray bottle,,, i ran the motor with 10-30 penzoil basic oil,, switched to mobil 1 and lost about 5avg horsepower. i thought mobil one was crap but then was told you need the red bottle,, thats the racing oil,, it has zinc in it... the gray bottles have almost no zinc,, ill never run mobil one in anything i own again,, its red line, valvoline vr, or joe gibbs

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Amazing the different experiences people have. Wonder how many problems are really lube related . I run Royal Purple full synthetic in my 408. Three years now. Change it once a year. No abnormal wear or scuffing problems that I have noticed - and I have had several bad over heats due to blown belts. I usually run one or two grades lighter in viscosity than if I were running petroleum based oil. Definitely believe there is a friction advantage with synthetics - without film loss. I do run a zinc additive with it as I am running a large flat tappet hyd.

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Could be?? My edit was that last sentence. I guess that's my security blanket Been running the same flat teppet ( over .600 lift ) for 3 years now, so I probably don't need the additive anymore.

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how much extra oil do you guys put in with a fresh motor over what is usual once its been run? like if its got a 7 qt system do you put 7 in it fresh,, or 9? or??

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