Re: H engine broke in Have oil question

Posted by gusc on October 12, 2004 at 21:56:40 from (63.97.117.12):

In Reply to: Re: H engine broke in Have oil question posted by captaink on October 12, 2004 at 07:32:10:

cap,

The reason auto mfg changed to 5W oil was to decrease engine resistance and increase gas mileage to help meet gov requirements.

I'm probably older than your Dad and I agree with him about lighter oils being better, especially in new engines, but I use heavier oils in older, worn engines in my warmer climate. Very cold areas are another story. I use 10W30 in winter and 10W40 in summer. My wife had a 1979 98 Olds with a 403 that we gave away at 258,000mi and I always used these weights.

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