I've read that it is considered acceptable for my VW 1.8T to lose 1 quart of engine oil every 1,000 miles. Well, now I'm losing about 1 quart every 700 miles. I know my valve cover gasket is shot and needs to be replaced but I don't want to spend the money right now. I'm just checking the oil level every 100 or so miles and topping up. Oil sump capacity is 4 quarts, and I'm adding about 8 quarts between every 5k mile OCI. My question is: If I'm adding this much new oil so often, can I safely extend my OCI to 10k miles, or even longer?