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From : beekeep

Q: marcus wrote remember also that the worst wear occurs on cold startup. 5w30 would be best for an engine in good condition since it would minimize startup wear and still increase its viscosity to the higher number as engine temperature builds. 20w50 would result in poor flow on startup with increased wear as a result. as the miles on the engine climb higher and clearances increase 10w30 might be a good step since its a smaller range of viscosity and therefore should have less additives which contribute to deposits. what do you think dj wrote my truck calls for 10w-30 and in florida i dont 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 wouldnt 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 wouldnt 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. you need just enough viscosity to maintain proper pressure and no more. extra thick oil does not provide extra protection it takes more energy to move it around and puts excess strain on the pump and pump drive mechanisms. i run 5w-30 in my truck year round. in the summer i often tow a trailer in temps to the high 90s. in the winter it only gets down to about 0*. oil pressure is always right where it should be. still running great after 82k miles. -- .bob 2006 fxdi hot rod 2001 dodge dakota qc 5.9/4x4/3.92 1966 mustang coupe - daily driver 1965 ffr cobra - 427w efi damn fast. use the thinest oil recommended in your owners manual for the temperature range in your area and a good filter. my guess would be 10w-30 down south. i also suggest that you go with a good synthetic oil as well. a good synthetic oil and filter will provide better lubrication and last longer than regular motor oils. as a side benefit the base stock for most synthetics doesnt come from the oil field. amsoils website has a lot of good information. their website is www.amsoil.com. .