i went on vacation with my 5.7 van pulling a 25 foot travel trailer. we were going to fl. and i change oil to
20-50 mobil1 before leaving RI. after we were in FL about 1,000 miles from home i started to here a ticking noise when starting after it was warmup it would go away in about 30.sec. while in FL. i change oil back to 5-30 mobil 1 but could still her the noise when starting. did i cause any damage? thanks billw