I tried doing a search on here and didn't see much in the way of discussion for these 4.0L engines. I just got myself a used 1991 Explorer that has done a bit of sitting around for the last 2 years. Assuming the previous owner was doing 3,000 OCI (he has the next change due in 2,873.2 miles) it has been driven 126.8 miles in the last 20 months. The previous owner was very good at maintenance and proper care but he didn't have much use for this vehicle and was looking to move on (it's got problems due to age but not enough to scrap the car).
When I got it home, I put 12oz of MMO in the oil (due to a valvetrain tick when cold) and 12oz in the half-full tank. I plan to drive it a bit more to let the MMO do it's thing but I'm wondering what oil you guys would recommend. I'm not too concerned on price as this won't be a daily driver and will likely only have 1 oil change a year. It's hard to tell but I think the engine has 224,526 miles on it but as far as I can tell doesn't burn or heavily leak oil. I've pulled a couple spark plugs and they are old enough to be rusting and have some electrode wear but otherwise look good in terms of fouling.
I'm leary of synthetic in an older engine but I've done 2 changes with Valvoline MaxLife High Mileage which is labeled as a blend in a 92 Suburban without complaint.
Shoot me some suggestions, I'm open to anything! Thanks.
When I got it home, I put 12oz of MMO in the oil (due to a valvetrain tick when cold) and 12oz in the half-full tank. I plan to drive it a bit more to let the MMO do it's thing but I'm wondering what oil you guys would recommend. I'm not too concerned on price as this won't be a daily driver and will likely only have 1 oil change a year. It's hard to tell but I think the engine has 224,526 miles on it but as far as I can tell doesn't burn or heavily leak oil. I've pulled a couple spark plugs and they are old enough to be rusting and have some electrode wear but otherwise look good in terms of fouling.
I'm leary of synthetic in an older engine but I've done 2 changes with Valvoline MaxLife High Mileage which is labeled as a blend in a 92 Suburban without complaint.
Shoot me some suggestions, I'm open to anything! Thanks.