I sent an private message to a fellow member on www.honda-tech.com and this was our discussion. His post that caught my eye was this. " Using 10W30 when outside temperatures are below 20 degrees F is not recommended, according to the owner's manual. And, as noted above, 5W30 is preferred at all temperatures. Am I the only one who has ever opened his owner's manual? " BrewCityR (10:07 PM 3/10/2003): I no doubt agree with those 10w30 recommendations. I think with a good synthetic or syn blend (Schaeffer) 10w30 is fine for 0,5,10 degree Farenheit startups. Granted, I may buy a case of 5w30 Schaeffer for my daily driver next fall/winter to use. py1091 (10:09 PM 3/10/2003): The owner's manual has the Acura name on it. It was written by the engineers who designed the car, including the engine. BrewCityR (10:12 PM 3/10/2003): So you wouldnt agree that the cold pumpability properties differ from dino to semi-synthetics to synthetics? py1091 (10:17 PM 3/10/2003): I think your logic is convoluted if you think that you can use a viscosity that is NOT recommended in the owner's manual but you are trying to justify it because it's synthetic instead of conventional oil. And you are definitely DISOBEYING the advice in the owner's manual, which states, "You may use a synthetic motor oil if it meets the same requirements given for conventional motor oil: energy conserving, a service classification of SJ, and the proper weight as shown in the chart". Furthermore, if your car is under warranty, using the wrong viscosity of oil gives them a basis for denying warranty claims if anything goes wrong with your engine. BrewCityR (10:19 PM 3/10/2003): LMAO. Don't disobey the owner's manual as you might get sent to your room. Thoughts, comments? Just wanted some feedback.