- Joined
- Jan 16, 2025
- Messages
- 13
Hey, I’ve got a 1981 GMC K1500 that's been sitting for quite a while. When I finally got the motor running, the first thing I did was change the oil, but the old oil came out really sludgy. I went ahead and put in a cheap oil filter and added some 10W-30 with zinc. Now, I'm trying to figure out the best course of action moving forward. Should I change the oil again after 1,000 miles and keep doing that for a bit to help clean things out, or would it be better to try flushing the engine to get rid of all the sludge more quickly? Also, do you think I should consider switching to a full synthetic oil after a few changes to help keep the engine cleaner and running more smoothly? What’s your advice?