Quote:
Originally Posted by eddytheb
Does roush tell you what oil to use? I know there have been allot of changes in the oils over the years and many are not good for some motors. The feds made it hard for the oil company's and lots of things have been removed from the oils. I know for some time we could not keep cams in motors and it was the lack of zinc and a few other things that were not in the oil anymore. I am very carful what oil I use in fresh builds and older style motors.
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Roush says to use 10W-30 for break in non-
synthetic. I'd wonder how many installs go and stick
synthetic in there or another weight, or no break in. I've always used Castrol 10W-30 natural S classification oil in my Roush 427R with the highest second letter I can find. SJ is pretty easy to find and it would have the better protection than something like SG or such.
This is an interesting link.
http://www.syntheticlubes.com/what_is_a_motor_oil_.html
Something about a street car that we fart around in 99% of the time is it makes sense to me to keep running natural 10W-30 and just change it every 500 or 1000 miles. The very marginal amount of time one might hammer a few gears on the on ramp to the freeway or make one or two car club day idle start drag passes for 11 seconds isn't going to comprimise the oil and its ability to do it's job on a properly tuned engine. On the other side of an extreme if the engine was to be put at continued stress doing laps for several minutes without relief another oil might be better. Lap cars wear out faster. Lap cars on wrong air fuel ratio break real quick.