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secondchance · 08-24-2006

My understanding of this subject is for cold start (especially in winter) low viscosity for first designation helps with faster distribution of oil. Once at operating temperture, especially in hot weather, higher viscosity for second designation would be preferable.

For this reason, 0-40W currently available for Mobil 1 would be a good choice in cold weather whereas 10-40 would be fine for hot weather use.

Most auto manufacturers typically recomend 5-30W or 10-30W and my personal assumption is, and I may be wrong, the reason they stay away from 5-40W or 15-50W has more to do w/ mpg rating than engine protection issue at high operating temperture.

08-24-2006	#7
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,729	Re: Would 10W 30 Oil Hurt the Engine My understanding of this subject is for cold start (especially in winter) low viscosity for first designation helps with faster distribution of oil. Once at operating temperture, especially in hot weather, higher viscosity for second designation would be preferable. For this reason, 0-40W currently available for Mobil 1 would be a good choice in cold weather whereas 10-40 would be fine for hot weather use. Most auto manufacturers typically recomend 5-30W or 10-30W and my personal assumption is, and I may be wrong, the reason they stay away from 5-40W or 15-50W has more to do w/ mpg rating than engine protection issue at high operating temperture.