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as removing the head this would give you better view of the engine so you may be able to see the oil filter part .Just a thought not leaking from head gasket ,you'll find out when removing head i guess
5 qts ,check dipstick dont overfill, bring up to top of fill line. I always get 6 qts. my car uses about 1/4 quart every few tanks of gas, always check oil levels every fill up. Low oil does alot of engine damage
I just bought a 2005 envoy too. I read in the manual that the 4.6 6 cyl engine needs 7 qts total. 2 Over the normal oil change. Is it possible it wasn't low to start? I noticed when Walmart changed the oil they charged extra for the change because it needed the two extra qts. However my dip stick has oil over the full mark. Seemed strange but I haven't had any leaks and after 3k mile no change in level. Make sure you had the correct about the first time.
Depending on what engine this is, you should drain oil, change filter, add 3.75 qts of oil, then start engine to check for leaks. Turn engine off, then check the oil fill on the dipstick. Add to proper amount generally at 4 or 4.25 qts.
More than likely it takes 4.5 quarts or possibly 5 with oil/filter change. But to make sure there is an easy way to find out.
Park the vehicle on a level surface. Drain all the oil out and change the filter. Now pour in 4 quarts of the correct weight oil, and start the engine. Let it run for 30 seconds and then shut down for 30 minutes. Check the level of the oil and add as necessary to fill it up. Probably wil take 1/2 or 1 quart. Warning: Do not overfill!