This is Mobil 1 0W40 SN European LL01 Formula. 2002 Buick Century with GM 3.1L V6. 5,522 miles on oil with a Fram Ultra XG3377A + filter mag.
Now monitoring possible coolant leak into oil. No uoa was done on the last fill between October and now we racked up a lot of miles so I dumped it pretty quick.
I'm not 100% sure if sodium is from oil or not because sometimes I dump random oil into the sump while I'm doing an oil change and the plug is out/empty to flush extra junk out of the pan.
I am losing some coolant though, I had to top off the overflow tank twice in a year iirc. Coolant is Zerex G05, so I'm not sure if sodium would be from that or not.
The shorter changes are because of monitoring previous high wear and known coolant loss. Current fill is the same Fram Ultra filter with a brew of synthetic I had lying around, 1 quart Mobil 1 TDT 5w40, 1 quart Mobil 1 High Mileage 5w30 and 2 quarts edge 10w30 gold bottle.
Now monitoring possible coolant leak into oil. No uoa was done on the last fill between October and now we racked up a lot of miles so I dumped it pretty quick.
I'm not 100% sure if sodium is from oil or not because sometimes I dump random oil into the sump while I'm doing an oil change and the plug is out/empty to flush extra junk out of the pan.
I am losing some coolant though, I had to top off the overflow tank twice in a year iirc. Coolant is Zerex G05, so I'm not sure if sodium would be from that or not.
The shorter changes are because of monitoring previous high wear and known coolant loss. Current fill is the same Fram Ultra filter with a brew of synthetic I had lying around, 1 quart Mobil 1 TDT 5w40, 1 quart Mobil 1 High Mileage 5w30 and 2 quarts edge 10w30 gold bottle.