I've used mobil 1 in my 92 integra and it even burned in the b18a1 motor. I run it now with Quaker State regular and I don't lose a drop. My R loses at leastg a quart or two of Royal Purps between oil changes. I don't mind adding it because the oil does really make a difference and my compression is just fine(111,000km) Why be cheap on oil?, a good filter doesn't hurt either(oem,hamp,Knn)