Originally Posted By: MiKe3o
173000 on a mountaineer 5.0. 4 months and 4000 miles and I only drained out 3.5 quarts out of 5.5 and now have a rear main oil seal leak. truck has had motorcraft 5-30 blend its whole life and I changed only to even up both cars. Should I drain it and go to a Pennzoil high mileage or go back to the motorcraft? but could the damage have already been done?
So was the RMS completely dry before the synthetic oil change?
173000 on a mountaineer 5.0. 4 months and 4000 miles and I only drained out 3.5 quarts out of 5.5 and now have a rear main oil seal leak. truck has had motorcraft 5-30 blend its whole life and I changed only to even up both cars. Should I drain it and go to a Pennzoil high mileage or go back to the motorcraft? but could the damage have already been done?
So was the RMS completely dry before the synthetic oil change?
