5W-30 vs. 10W-30

I use a 5-30 in winter, and a 10-40 in summer for my 88 civic, also in
mid-ga. burns a bit of oil, and a little water in the summer (refill
the expansion bottle once a week basically) but its been 3 years and
no problems on that score.

 

I did it with an 89 volvo340. Had 130k miles on it, did an oil change,
and changed from regular dino-juice to synthetic. not leaked a drop.
Similar experiances with my fathers 89 golf.