kindwarf Posted August 3, 2008 Share Posted August 3, 2008 I just looked at the service history for my 95 300 tdi and it said the oil was replaced with semi synthetic 10 40 , but I always use 5 30 fully sythetic previously will it run any better if I put fully synthetic in. Quote Link to comment Share on other sites More sharing options...
Les Henson Posted August 3, 2008 Share Posted August 3, 2008 Using mineral, semi, or fully synthetic oil won't make any difference. 10/40 is thicker than 5/30 though. It's acceptable to use a slightly thicker oil if the engine has done a lot of miles - I never go higher than 15/30 though. Les. Quote Link to comment Share on other sites More sharing options...
k9unit Posted August 3, 2008 Share Posted August 3, 2008 I just looked at the service history for my 95 300 tdi and it said the oil was replaced with semi synthetic 10 40 , but I always use 5 30 fully sythetic previously will it run any better if I put fully synthetic in. use old fashion 20/50 and change every 4/5000 and filter Quote Link to comment Share on other sites More sharing options...
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