Bigblue90
Newbie
I have a question regarding the factory oil cooler and doing an oil change.
My 1990 GMC C1500 came with the factory heavy duty oil cooler. I didn't know when I bought it and I did my first oil change (5 quarts Mobil 1 High Milage Full synthetic, MicroGaurd Select Oil Filter, ZDDP additive) without doing anything different from my cars that don't have an oil cooler.
I noticed that after changing the oil it seemed a little bit overfilled. It wasn't by very much so I decided to just run with it.
I later discovered that I had an oil cooler while crawling around under the truck. I checked my Chilton Manual and it has a very brief mention that one must also drain the oil cooler when doing an oil change.
Is it possible that there was extra oil sitting in the oil cooler that I didn't manage to drain out?
I'm planning on doing another oil change soon, so I have a few questions
1. Is there a drain plug on the factory oil cooler that you need to remove to let it drain fully?
2. The owners manual doesn't list a different oil capacity for models with an oil cooler. Will it still only need 5 quarts?
3. Should I be running a ZDDP additive in my oil or should I try to get Diesel oil with higher levels of zinc in the bottle? Or should I just forget about it and run with just straight motor oil?
4. Is it possible that I damaged my engine running it slightly overfilled for a few months? I did notice it sometimes would smoke on a cold startup, even during the summer.
My 1990 GMC C1500 came with the factory heavy duty oil cooler. I didn't know when I bought it and I did my first oil change (5 quarts Mobil 1 High Milage Full synthetic, MicroGaurd Select Oil Filter, ZDDP additive) without doing anything different from my cars that don't have an oil cooler.
I noticed that after changing the oil it seemed a little bit overfilled. It wasn't by very much so I decided to just run with it.
I later discovered that I had an oil cooler while crawling around under the truck. I checked my Chilton Manual and it has a very brief mention that one must also drain the oil cooler when doing an oil change.
Is it possible that there was extra oil sitting in the oil cooler that I didn't manage to drain out?
I'm planning on doing another oil change soon, so I have a few questions
1. Is there a drain plug on the factory oil cooler that you need to remove to let it drain fully?
2. The owners manual doesn't list a different oil capacity for models with an oil cooler. Will it still only need 5 quarts?
3. Should I be running a ZDDP additive in my oil or should I try to get Diesel oil with higher levels of zinc in the bottle? Or should I just forget about it and run with just straight motor oil?
4. Is it possible that I damaged my engine running it slightly overfilled for a few months? I did notice it sometimes would smoke on a cold startup, even during the summer.