Question about 1995 Chevrolet Astro

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Astro Van is running rough

My 95 Astro van is running rough when trying to maintain speed. I added 5W30 as stated on the oil cap but I think the last oil change may have been 10W40. Would having the two different oils in the van cause a problem like this?

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  • thorny_5 Apr 13, 2009

    Thanks...one thing down. We were thinking it might be time for new plugs...but such a pain to get to on the Astro!

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Mixing two different oils wouldn't matter, but 10W40 is way too viscous for that engine. Replace that with 10W30 asap. The first number is the cold cranking weight, the second number is the weight at operating temperature. 10w40 gets worse for that engine as it approaches operating temp.

Posted on Apr 13, 2009

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No,the oil ratings 10w30 and so refer to how the oil viscosity reacts to hot and cold.As far as running rough,when was the last time is was tuned up,cap and rotor if applicable,spark plugs and air filter?Is it carburated or EFI?

Posted on Apr 13, 2009

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