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You can use Lucas oil treatment in just about any type of oil. I use it with Valvoline high mileage.
No, you can and should use high mileage oil if the vehicle has over 100,000 on the ODO.
A high mileage 10w30A high mileage 10w30
I recommend a high mileage oil such as Pennzoil High Mileage in the weight the manufacture of the vehicle recommends.
15 40 wight oil
SAE 5w20 High Mileage oil any major brand. If it is burning oil then use SAE 5w30 High Mileage.
I use Penzoil high mileage in my 105,000 mile LT1 caprice with an AC Delco filter. You can get a 5 qt jug for around $13 at walmart.
Use the manufacture recommended weight and switch to a High Mileage oil.
I typically use high mileage 10w30 from havoline
It is not normal for a healthy engine to use oil unless it has high mileage or the wrong oil is being used. Adding a qt between oil changes would be acceptable with a high mileage vehicle.
You have to know what viscocity to use, check the owners manual if you have one. But with that being said, always use a synthetic oil for a vehicle with higher mileage.
SAE 10w30 high mileage oil. Most major brands maker a high mileage oil. I personally use Pennzoil in my Toyota Tacoma with 130,000 miles on the ODO.