The RV service place put an oil that is spec'd for MB 228.31 but the 2006 model year spec is for MB 228.3. They have agreed to change the oil, but how much driving can I do until then? They are about 50 miles from me and it's going to be a few weeks until I can get bak over there. Meantime, we need to use the RV. Is 2000 to 3000 miles too much?