Quote:
Originally Posted by sonic370
does anyone know when or why all manufacturer's went to 5w30 oil.
i grew up on 10w30 here in Texas.does it really make that much of a difference
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5W30 is typically recommended for drivers who live in colder climates. I believe the magic number is 20 degrees F. So, living in climates that drop below 20 degrees F 5W30 is recommended, in most cases.
Aside from climate, todays engines were built with tighter bearing clearances for better fuel economy, thus using a 5 weight (5W30) is recommended.
Older engines engineered with larger bearing clearances, or vehicles with high miles more than likely will achieve ideal oil pressures running with a 10 weight oil (10W30).
Hope this helps...