jmwgomz Posted February 25, 2005 Share Posted February 25, 2005 Hey guys, I have a 1991 LS400 with 175,000 miles on it. I want to do my own oil changes but am not sure which oil to use. I know what Lexus recommends but I believe that mileage is a factor in the decision as well. I would greatly appreciate your thoughts on this matter. Quote Link to comment Share on other sites More sharing options...
silvermate Posted February 25, 2005 Share Posted February 25, 2005 do a search this his been talked about a million times Quote Link to comment Share on other sites More sharing options...
jmwgomz Posted February 25, 2005 Author Share Posted February 25, 2005 Hmm, after searching around on this forum it seems that the general concensus is Mobi 1 synthetic. I hope there is nothing wrong with any of my seals. Since the car has such a high mileage, I think that I will probably go with 10w-30. I know that the following oils have been used in the car before: Castrol GTX 10w-30 Castrol GTX 20w-50 Castrol Syntec 10w-40 Do you guys see a problem with any of this? Your input would be greatly appreciated as I hope to change the oil tomorrow morning. Quote Link to comment Share on other sites More sharing options...
SRK Posted February 25, 2005 Share Posted February 25, 2005 The oil filler cap says 5W-30, and that will be fine for the life of the engine. For sure 20W-50 is an obsolete oil viscosity except for clapped out English sports cars, and should be avoided. Even highway semi-tractors use nothing thicker than 15W-40. Stick with 5W-30. Quote Link to comment Share on other sites More sharing options...
jmwgomz Posted February 25, 2005 Author Share Posted February 25, 2005 I don't think that the 20w-50 was used more than once. And I think it was in the engine for about 2.5 months (2,700 miles). Do you think this could hve caused any damage. I have not noticed any problems with the car. It runs great. Quote Link to comment Share on other sites More sharing options...
SRK Posted February 25, 2005 Share Posted February 25, 2005 Probably no damage at all, and not worth worrying about. Just use the correct oil from now on, and rack up the miles and enjoy the car. Quote Link to comment Share on other sites More sharing options...
jmwgomz Posted February 25, 2005 Author Share Posted February 25, 2005 Nice! Thanks a lot for your input. Quote Link to comment Share on other sites More sharing options...
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