Not another oil thread!! What difference does a group 3 or 4 or 5 oil make? These cars will go 300K, 400K, etc. on regular oil. If you want to spend the money on a group 5 oil then go ahead but you might as well set the extra money on fire because you aren't really benefiting anything. If you plan on extending oil drain intervals that may be a reason to try a group 5 however these old diesels put enough soot into the oil that extended drains aren't the best idea anyway. Group 3 oils like Rotella and Chevron synthetic work great for winter starting and won't kill your budget. RT

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When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K