Waukegan Auto Repair

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The Importance of Preventative Maintenance

The Importance of Preventative Maintenance

Recently we had a 2002 GMC Savanna come into our shop for a starting issue and needed a service for preventative maintenance. This vehicle has a G2500 5.7 Liter engine. First, we installed a new battery, as well a starter. After the install we proceeded to change the oil. After draining the oil we inspected it to find a chocolate milky oil. What is that you might ask? When coolant mixes with engine oil, it creates a light brown liquid that looks an awful lot like chocolate milk. If you notice this on the dipstick, or in the pan after draining it, there’s a problem and you need to diagnose it.  Finding the leak can be tough to do, though, unless it’s something pretty obvious like a cracked block. Check for head gasket leaks, and if necessary, do a leak down test on each cylinder. Now we are in the process of pressure testing the system. We now have to dismantle the engine to check for damage. We remove and dismantle the front clip. Only to find th ... read more

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