quote:I would think the 5/30 would be up to the task but the 10/30 might be a tad better . I would avoid a higher VI oil for as long as possible due to extra oil pump wear. Might throw a quart of 15/50 in with 10/30 SS if you are going to run it fast,,,,ya know just thinking about it,you have to run very high speeds with that car to get the rpm up to a worry point. They just loaf along
Originally posted by johnicon: 2001 Ford Crown Victoria, 4.6L V-8 with 10,000 miles. I usually use M1 5W-30, but I may be driving cross country this summer and I'm wondering if I should use a heavier oil.
quote:True, but even a good dino oil could go 10,000 miles quite easily in a good solid engine that is being run on a pure highway trip like this.
Originally posted by pedaltothemetal: Synthetics can go 10000 miles between drains. You can go cross country and back and then some.
quote:I'd look at piston speed more than RPM. I bet you have a relatively low piston speed at that RPM. Here is a little piston speed calculator. http://www.prestage.com/carmath/calc_pistonspeed.asp At 80, my LT1's (3.48" stroke) average piston speed is 1242 FPS.
I push 3K rpms at 80mph!