Hey just bought a 98 sl2 with 138K with manual trans. I was wondering what rpm should i be turning at 70 mph?

If in 5th, I'll guesstimate 2378.534 rpms.... give or take 500... :popcorn:

don't worry it should be a little on the high side (closer to 3k) . it is a 125 hp 4 banger