My truck calls for 10W-30 and in Florida I don't need to worry about operation below freezing hardly at all. I have been running 20W-50 in most of my trucks because it often sees operation in temperatures above 90 degrees and above 100 in the summer. I know that on startu-up 10W-30 reaches the bearings quicker, but wouldn't 20W-50 give it more protection in high heat conditions? Also, I noticed the new 5W-30 oils out there. All Data has the 5W-30 listed as an option in my truck. Is there any advantage to 5W-30 over the others? I would think the thinner oil wouldn't protect as well under harsh conditions like 4 wheeling or towing a trailer. I would appreciate you comments. I currently run Castrol 20W-50. I would never use Quaker State after rebuilding my fair share of Quaker State engines with an inch or two of sludge build up from the parafins in QS.
- posted
17 years ago