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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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#59973 05/03/2006 5:35 PM | Joined: Apr 2006 Posts: 236 'Bolter | | 'Bolter Joined: Apr 2006 Posts: 236 | Polymers are added to an oil that meets the low temperature requirements to keep it from thinning out. This allows it to meet the high temperature requirements as well. A 5W30 oil is really a 5 weight oil with polymers added to make it behave like a 30W oil at high temperatures. Mixing a 5W30 with a 10W30 50:50 probably won't get you a "7.5W30" oil. Having said this, I wouldn't worry about the occasional mixing of 10W30 oil with 5W30. That second number is the most important one once the weather starts to warm up and you don't have to worry so much about the oil flowing like mollasses in winter. Since both oils behave like 30 weight at high temps, you should be fine, though with the addition of the 10W30 (which has fewer/different polymers than the 5W30), it might be slightly thiner at high temp. Say 28 weight oil??
58 Fleetside, 235, "The Old Buckin' Bronco"
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