I was wondering on how long I should run the oil its has 4 quarts of mobil 1 5w30 tri-syn and 1 quart of redline 5w30 with 5 ounces of lc with a pure one filter at fill (6/29/05)and I put 2-3 oz of lc every 1000 miles. I did the autorx process the oil change before. I have this mix running for 3900 miles the car does mostly city driving and short trips, I use fp as well. Its the first time using LC should I dump it since the car won't be driven for about a month? The severe service is 4500 miles and normal is 7500 miles. Avg temp right now in nyc is around 30f any help is appreciated.