The wastegate hose on my 85 300 SD appears to be leaking a small amount of oil. I tightened the hose clamp and this may stop the leak but is it normal for oil rather than gases to pass through the hose ? Does this indicate there is oil getting into my turbo which shouldn't be doing so ? My SD runs great but uses much 1 quart of oil every 250 to 300 miles and we have tried without success for a year to find the cause of the oil use. Compression is good.