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Discussion Starter #1
Changed the oil in my 2003 S10 crew cab today, with mobile one synthetic. The 4.3 oil cap. is 4.5 qts. and I was thinking the jug I had was 4 quarts, it was 5 qts putting it 1/2 qt over. Yes, every manual says don't over fill but I've read that on most engines you can go a quart over with no problem. I don't see how a half quart could possibly cause a foaming problem. Anyone else do this and just leave it in?
 

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94 4x4,01 Blazer
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803 Posts
Your oil pan will hold more than 5 qts without any issue.The problem that arises from overfilling is at a high enough amount, the oil will come in contact with the crank , causing said foaming as it gets continually stirred by the crank. Plus that also adds a boatload of drag to your moving parts,robbing you of power and milage.
 

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Discussion Starter #5
Just to update, brought the engine up to operating temperature at 50 mph and my gauge is reading 45 psi. It was 10-30 Mobil 1 but truck has 160 + thousand miles. I don't put 10,000 miles on this truck so ought to be good for the year.
 
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