Welcome to the forum. All the questions you have, have been discussed to death. At the top of your screen is a search function. Log in and insert "oil cooler hose" and various variations to that. You will find numerous posts on the oil cooler line replacement. Removing the left engine mount IS the easiest way to do the job. Lifting the engine is not neccessary, just support it. I know its a lot but you want to do it right. Loosing these lines means loosing all oil, not a good thing.

Do searches on all your questions. If your particular question is not answered then of course post your question.

Here is a good post on "TROUBLESHOOTING, Get the Most from your Post!"

http://www.peachparts.com/shopforum/showthread.php?t=127342

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car